Yes, I've built one. I made the Australian version and added my own gun shield out of plastic card.
It's a superbly engineered kit like most of their models. Easy to put together and the instructions are clear. If you aren't familiar with with the various iterations of the M113 family and national preferences it's sensible to pay attention to the instructions before starting the model as you can make an Australian variant with different air filters to the US standards and ACAV variants.
Plenty of detail, including interior detail. including an engine and driver station. You can omit some of that if you don't wish to have the vehicle open, some of the stuff in the rear passenger area is required as it' part of the structure. But it's a beautiful kit to have open even if it's jut the rear hatch because there's sufficient detail that merits viewing, like the crew commanders seat. I kept the top hatch open and plonked a seated figure in there. I'll be buying a couple more once they release the T50 turret but I'm thinking of getting at least one other just so I can open the whole thing up, as the rear ramp is also able to be posed open. They even give you interior decals for the engine firewall.
Decal sheet is extensive and very good. Overall it' very hard to fault this as a model. It's accurate and builds easily. My only minor nit picks would be the size of the brush guards for the aerials (which you can cut down anyway if you wish) and the absence of stowage but no doubt they will remedy that soon. That and the fact that the crew are all in flak jackets. You get four crew, two driver poses and two crew commanders/gunners. Plenty of spares for the box
Highly recommended.