I buy all my USA Gamecube games from them. They are literally amazing. They mark everything as a gift - so, combined with the free worldwide shipping, the price you see, is the price you pay.
I have ordered multiple games (5 being the most at one time)from them at the same time, they always package them individually in brown, padded paper envelopes.
However, I did not buy my Gamecube from them. Combined with the fact I wanted a modded USA/Jap cube, I also didnt want to pay the shipping - they charge shipping on consoles. Saying this though, I do believe that I once read that gameboys etc were free shipping (dont hold me to that though).
I'd go for it if I was you. Maybe you should search around for a cheap GBASP over here, in the UK, and just get the games dirt cheap from them, I dont know.
The only complaint with them is 'time'. from your order being placed, it usually takes 1-2 weeks (to the day, either 1 week or 2), for the order to be sent - it then takes exactly 1 week to reach the UK. You could always pay for the DHL shipping - but then that defeats the purpose. I ordered Resident Evil with DHL shipping (I was desperate) from them, got it the day after release in USA. Also got a free Resident Evil T-Shirt for winning their competition. Got stung with import tax on that though, luckily it was a few games for friends inside the box, so we could split the cost.
OMG, I'm writing an essay here....must stop.....now...gotta to ..g..o...(thud)