I sold my Synergy rig a while back, but it was right before the 6505 was released, so I haven't gotten to play it or the Drect yet. Been curious about the new Dr Z module, and this one as well. I've thought about going back a few times but I would go with one of their heads instead of the rack setup this time.
I was using the preamp with my Fryette PS-1 and I didn't find the tone variance between the modules to be as large as I expected with it and it just didn't sound as good as the modules did through my 101b's power section. Buddy of mine had the SYN-50 and it crushed my setup. I was going to get the 30 since I didn't really need more than one module at a time and not needing a dedicated clean module is super appealing, plus I love the small size. The new 20 has tons of cool features, but the EL84 power section is not appealing to me whatsoever.