I don't have any Transformer Revoltechs, but I do have a couple of Macross, Patlabor and Super robot ones. Quality varries a little from figure to figure, most of mine have had tight joints though.

There sculpted in a slightly posed fashion rather than perfectly symetrical, this however means its really easy to achieve awesome action poses, more so than almost any other figure line. Microman might be one of the excpetions, however a posed microman looks like an action figure, a posed Revoltech often looks more like a fixed pose figurine as the joints are usualy fairly well done.

Back when the dollar was high I would have said Revoltechs were the best value action figure on the market, now however they cost a bit more so its a harder sell, If you like putting Transfomers in exagerated comic or toon poses then you'll probably getb a kick out of them.