I have one, and they are good. It can store 20 presets. I have used four on a gig in one song but have it clipped to the leg of my steel. I play through a Fender FR12 powered guitar speaker. They don't play well with active volume pedals, though I have not tried the Lehle. I power it with an iPhone backup battery that plugs into the bottom.
These are amazing. Pretty steep learning curve. As noted here on the forum Joe Rogers has done great work on The Tonex to the benefit of this community.
Even with it only doing 3 amps at a time, how many times in the past have you used and carried 3 amps on stage. So, that makes it a great choice. It does hav a learning curve.