The mouse is too big and too tall which makes holding it very unnatural. It's too heavy with 2 batteries inside it, and I found that there wasn't enough precision. I had to really focus to hit a target. The middle button is really hard to press and it's awkward to get to as well because the mouse is so big. I found that after using this mouse for an extended period of time my arm was in pain.
The keyboard is also not comfortable to use. The keys are HUGE! This means that I actually have to move my wrist more than I would with a normal keyboard to type, which makes this keyboard unsuitable for an extended session.
Overall I am very disappointed with this product and I wouldn't recommend it.