I got Krypto the Superdog from the Funko "DC Primal Age" line in the mail yesterday. Other than the Mr. Freeze "Ice Variant", I've got that set complete now.
There were some quality control issues early on, but on the whole I really liked the Funko 5.5-scale stuff. They're a little bit bigger than the vintage MOTU figures, but I'm a sucker for that style and scale of figure in general and they still fit in really well with them. And with the DC stuff we even got three beast mounts and an awesome playset in the Batcave.
I ignored most of the knockoff lines back in the day as I was solely focused on collecting the "real" MOTU toys, with the exception of some of the wrestling figures by Sungold and Madison and so on, but ever since I started getting the Funko 5.5s I've really gotten the bug. I'd love to start collecting some of the old stuff like Galaxy Warriors and the Remco Warlord stuff and so on, but that seems like a costly undertaking at this point. I've come to really love the 5.5-scale fantasy figures, though, even beyond the regular MOTU stuff.
- - - Updated - - -
And today I can add another Funko 5.5 figure to the list, as I finally got Tygra from the "Savage World" Thundercats series!
Back in the 80s, all I wanted were for MOTU and Thundercats toys to be in the same scale. So I was pretty ecstatic when Funko started putting these out. Just need Jackalman and Monkian to complete this sub-series, and then Yellow Blanka and "Ice" Mr. Freeze to 100% the entire line.

It's so rare that I get to bring any line to 100% completion, pretty excited about it.