I use plenty of Microman stuff with my TFs, but not the newer stuff... the Microman 2000 1/24 scale Magne Power ones. I use Super Robotman Endeavor (TRU redeco) as Classics Ruination, who is a separate person from Onslaught and the rest of the Combaticons. I also use Super Robotman Dean (TRU redeco) as Dai Atlas. I know it's not a great fit, but I just liked the name. They're
sweet toys normally, but
the redecos are just beautiful and IMO far superior, I was lucky to get them.
Also, the
Magne Power Robotmen work well. I use Robot-Ace and
Hurricane Bird, Robotman Cross, and Robotman Baron as Nucleon-powered fighters who are able to reassemble themselves if destroyed. (Ruination shares the same backstory). I also use
gun-body, jet-mogler, and razor-master as Gunbarrel, Drill-Bit, and Razor-Sharp. They combine with either Ruination or the other Magne-Power Robotmen, as seen in the link. I also used the
Giant Acroyear for a while, but sold it; I didn't like it as much as the other toys.
The
Microman Change Troopers also work well for the same purpose. I usually have these guys, along with Dean, allied with the Autobots and all the other ones with the Decepticons.
Finally there is the
Microman Microboy, which is a Soundwave/Reflector/Real Gear type of robot that actually functions as a powersuit for the 1/24 Microman figures to ride in, but look like robots on their own (as do the Super Robotmen.)
I'm sure there's more, but those are the ones that I have and personally use.

I also have Automaster Ryan, and I use the assembled Biomachine as the powersuit that the Predacons built to take over Optimal Optimus' body. (seriously. The humans recover it and use it as a template to build their own powered suits.)