I've got the mixer, along with a power conditioner, a wireless router, and a powered USB hub wired up in an old rolling rack I had laying around for the time being, and that's generally working pretty well. I do want to eventually do a new stage rack that will contain my power amps, the mixer box, computer gear, and the few bits of outboard gear I'm using in a single rack -- on wheels, of course.
That laptop is a pretty ancient Dell with a single-core Celeron processor, running a funky Linux build. That allows me to run the full version of the Behringer X-Air app, which gives really deep access to the mixer and enhances my ability to save configs, on a machine I already had. I will be experimenting with another "computer" in the near future. More on that as it develops.
Since April, I've mixer a few shows on it, including two outdoor jobs, one of which was a multi-band mini-festival. In every case, the mixer has performed flawlessly, despite my still getting up to speed with it. The only problems I've had so far are related to the el-cheapo Android tablets I'm using, and those problems have only been on the outdoor gigs, where they are difficult to see in sunlight.
One area where Behringer has been lacking, however, is in keeping up with control app development. There is still no real parity between Android and iPad and PC/Mac/Linux applications, and Behringer hasn't updated anything. I got into some conversations with the fellow that Behringer had contracted to do the Android development, as he also develops an app for several other digital mixers (search for Mixing Station on the Play store to see if it's available for your mixer), and helped to convince him to release his personal version of the Behringer X-Air app. He's done a fantastic job with it, and added a ton of functionality. And, it fixes a meter display issue on certain Android tablets running Lollipop.
For the most recent gig I mixed (and performed at -- photo above), I used the new Mixing Station Pro X-Air app on the Android along with the Linux version of Behringer's X-Air Edit on the laptop. For the opening band, the keyboard player used one of the smaller tablets to handle his own monitor mix.
I should mention that, while I have my XR18 in a rack, it can also be used in a "stage box" configuration, by simply dropping it on the stage and plugging in.
While I miss the excellent iPad app from the Mackie, I think the X Air more than makes up for that in functionality and flexibility, and I'm pretty glad I made the switch.
Beyond the mixer, I also added a few new twists for this gig, and everything just worked perfectly. Once the PA was set up, I used an app on my old iPhone, which is now used as a media player, to pump pink noise into the PA. I then used an app called X Air iEQ on my iPhone 6s to analyze and automatically set the baseline EQ the mains and monitors. The process took all of 5 minutes for the mains and three monitor mixes.
Once that was done, I decided to try out a new piece of kit I picked up from dbx, called the goRack. The goRack is a neat little device that's really intended for solo or duo acts to help make getting good sound in difficult rooms easy. It incorporates a number of functions, including sub-harmonic synthesis, compression, EQ, and anti-feedback control into a very simple little box. I decided to turn on all the functions and put the thing to a test.
My sub-woofers are fairly small, but well built and tuned. Still, in an outdoor setting, the bass disappears pretty quickly, so I felt that a little help was in order. Also, my mains tend to be a little harsh, so I set an appropriate EQ preset. I next dialed in a little light compression, just to tighten things up. I made all these adjustments while pumping "break tunes" off the old iPhone through the PA.
Once I was happy with the overall sound, I setup the anti-feedback section (which was really the reason I wanted the goRack in the first place). There are a couple of settings you can choose, and I decided to go with a narrow band, but otherwise fairly minimalist setting. Once I had that entered, I grabbed the lead vocal mic, cranked up the channel, and pointed the mic right at one of the main speakers from about 15 feet away. There was a short "meep" of feedback (and I mean very short), and that was it. Even with an "MC" using a wireless and walking all over in front of the stage, we never heard another hint of feedback the entire day. All of the musicians commented on how good things sounded, both in the house and on stage. I was pretty impressed, too. Usually, anti-feedback devices are very heavy handed, carving out wide swaths of important frequencies to battle feedback.
I only had one goRack, which was enough to handle the mains and one monitor mix (I run mono mains almost exclusively), but I'll be ordering a couple more in the next week or so for sure! Here's the kicker on these little goRack boxes. For some reason, they're selling most places for under $30! At that price, you almost can't go wrong. And, if you ever perform as a solo singer/guitarist, one of these along with a powered speaker or two, are just about all you need for a PA system. Of course, your mileage may vary, but at $30, it's almost impossible to go too far wrong.