I just finished assembling mine. I have to say it is one of the most "beautiful" buggies I've seen. Very nice finished parts.

I like the way they kept all the items on the deck as low as possible and spread out across the entire chassis.

They did have a few problems with the early production kits, but Team Magic does have excellent customer support. They sent out a "loyalty" pack that included some replacement parts and spares. I'd say if you were to buy it, it'd be close to 100 bucks. Spare diff gears, diff pinions, arms, fuel tank, just to name a few.

There are a couple things that I notice right off the bat that might be an issue; The chassis seems to have a bit much fore and aft flex. Some lateral is fine but I'm not sure that having fore and aft is a good thing. My ST-R had some of that and it cause all kinds of issues from broken fuel tanks to grinding diff pinions. Driving it will be telling...

There aren't any aftermarket parts that I've seen. When you see one in person, its hard to imagine there'd be anything you'd want to replace.

As others have stated you can go wrong with any of the top buggies. Crompton in the UK is doing very well with his. I've had a MBX5 Prospec and really liked it. I hear the new MBX5 is supposed to be awesome. As much as I like my M1B, if I had another choice it'd be a MBX5 (whatever the newest version is)