I've reviewed toys from Chap Mei before and my initial impression of them still stands.
They are an excellent substitute to G.I. Joe figures when budget is a concern, with relatively good sculpting, play value, and quality. While the vehicles make great additions to your Joe or Cobra army forces, the accessories that the figures come with scale nicely with 1:9 scale figures (6-7 inches). The figures are a little less impressive on their own (they're not really in scale with anything they come with, and nothing really fits right), but any kid will tell you they don't care about that crap.
Though I had the chance to pick up some of the bigger toys a few years back, I just couldn't bring myself to buy any of the Raptors or the big tanks, since I don't really have the space for any of it. Seeing as I've dropped the G.I. Joe line from my current pull list (I didn't really like the last few sets after Pursuit of Cobra, but it has more to do with finances than anything else), it's probably a good thing that I didn't cave back then.
However, Toys 'R' Us' proprietary True Heroes toy line is making that resolution really hard for me.