I only have a few Mondo figures. I think the paint jobs on them are awesome; the colours just really look great. The sculpts are good and the size gives them a presence. As far as articulation, they are average - generally single elbows, but double knees.
I've seen some paint flakes off the figures near the joints and I've heard some people complain about the quality control in the past on specific figures.
Maybe look at some youtube reviews and see what you think.
They are definitely pricey and it's hard to say whether it's really worth it or not. I think it depends on your financial situation. When you are getting into hundreds of dollars that definitely will go a lot farther on most other lines OR even on things other than toys/collectibles.
As for myself, I already pre-ordered Mumm-Ra and I have Lion-O. I don't know if I'm in for the Cheetara that is expected next or any others at this point. As much as I like the figures, there are probably wiser ways to spend the money. I say that now, but when I see the next figure I may just go for it. We'll see.
That doesn't sound bad, honestly. I also collect Hot Toys, in addition to my 1/12 stuff, so I'm pretty used to average-poor articulation and high costs lol I might just have to go in on this Mumm-Ra, and grab Lion-O to go with him. I appreciate the opinion! Thank you.