Oh erm... I've actually got that arm as somebody gave it to me a present years ago It's okay as a toy but that's about it. The lifting capacity isn't brilliant and it does feel very cheap and plasticy. I've got a Lynxmotion Lynx 6 arm and it's much better.

The toy arm uses normal DC motors so is rather inaccurate for positioning. There's no feedback as well. It uses a weird thick fabric washer system as a slipclutch which also limits how strong the arm can be. I've no idea how good the PC interface is.

The Lynxmotion arm however is much sturdier and better construction. It uses proper servos so can be positioned quite accurately. You do pay for this however, it's around 4-5 times more expensive than the kit one.