I used the Maverick post on my first Megavalanche two years ago. It gave more problems than anything else on the bike, my dad had to keep on rebuilding it and adding more pressure. When it worked it was ok. It was stolen with my Mega and DH bikes after the Urban Downhill in Edinburgh, one component I was pleased to have stolen !
I’m now using a GD Turbo and it’s great. Nico Vouilloz and Julian Camellini had them on my first Mega and I was impressed with the speed they moved at. I thought this could be a problem, but it’s not. I thought just having two positions would be limiting, but it’s actually better, I only need two. I just leave the post on my Nomad and have used it on the Mega, Kielder Enduro, XC, street, dirt jumping and messing about ! The post is strong. The only problems I’ve had is the rubber bellows seeming to contract, exposing the sliding post, and the collar slightly unscrewing which means the post won’t stay down. I’ll see if I can get the bellows replaced and the collar just needs a little turn while riding to get it adjusted correctly. As it’s 27.2 it also fits my 224 for a mid-DH/Mega set up for the Mega Qualifier, something we discovered by accident on the Mega last year when I decided to ride my 224 instead of the Nomad on the Qualifier as there wasn’t much uphill. I used the Nomad on the Megavalanche itself though.
I haven’t tried the Joplin and other Maverick-like posts, but I couldn’t ask for anything more of the GD post.