We have used the Pendant at every show except for CanJam London (because I didn't have a 240V at the time) - and at Socal I had the MonoBlock version of the Pendant, which is called LeeLoo Suolo I believe.
The amps I usually show are the Pendant and a Glenn OTL - and then if I have more room on the table I fill it out with various other gear. If you need a pre-amp and to drive planars I would recommend the Pendant over a Glenn OTL or getting a Gel3n etc etc or something else with more power at 50 ohm's for planars.
Glenn's amps are absolutely killer - but since he his just one guy and his amps take a long time to build - I try to temper immediate expectations to ZMF owners trying to acquire one. If you can talk a Glenn owner into selling theirs - more power to you!
For me it's more about if you want an OTL type sound and tube Nervosa vs a more powerful transformer coupled amp that is slightly quieter regardless of tube in the Pendant. They are both fantastic but you have to build in how long you are willing to wait, how many tubes you want to get etc etc.
There's a review of the Pendant on Earphiles right now:
http://earphiles.org/2019/04/zmf-pendant-review/
I tried to work with Justin at ampsandsound to tune the Pendant to perfectly match our headphones and also work well with any other headphone you can throw at it and I think we did a great job!