I like the MPC more than the Chunky Monkey. It's alot more posable and gerwalk is definately it's best aspect. It doesn't feel fragile like the Yamato (even the 1/48 with it's backpack area, in particular). It's not a bad buy at all... just don't pay too much ($50 bucks is reasonable IMO).
I like my 1/60 overall better than all of my other valks, though... especially to zoom around the house, etc better than the 1/48s (which are the best display pieces... just a tad too big, especially in Super/Strike trim, to actually pseudo-play with). Plus they have the largest selection of variants and such, as well.