eklynx

I have owned an M20D since it pretty much came out and it has done a fantastic job.  The sound is clear, it's easy to use, but has enough advanced options if needed to really tweak the sound well.  The SD card recording has been great
 
That being said, there have been no updates or talk of updates to this mixer since Yamaha bought out Line6.  I've also outgrown it (I needed more inputs and aux outs).   As the digital mixer space has grown in the last handful of years I've switched over to the Yamaha TF series. I've been using the TF3 now for almost a year and have the Rack version pre-ordered for smaller setups, but with the stage boxes to be able to expand the connection capabilities.  Downside is multi-track recording now has to happen on my laptop through the Dante card (i think the USB connections will only record stereo to a direct drive.  USB to Host computer is multi-track audio though i think).
 
As for the other companies: Soundcraft makes some good boards as well, but again, no SD Card recording to my knowledge, and don't know about any multitrack capabilities.  I cant's stand Behringer high ends (too harsh with more digital artifacts), and the reverb on the Mackie boards drive me nuts.
 
Just my 2 cents.

You need two receivers as well, as each receiver can only pick up one signal, though two G55 receivers side by side will fit in one 1U rack space.

Apparently I just had to re-seat (unscrew and re-screw) the capsule and it works fine, thank dog....

RF mode didn't help.  Looks like it was the venue.  Took the system from our rehearsal space (heavy in wifi all around) to a show (only 2 wifi hotspots around) and the system worked flawlessly without interference.