I've had one of these in my 986 for a few weeks now, and I'm generally happy with it. I bought mine directly from
Ultimate Cupholders, which might be a better option if you're worried about eBay scam artists.
I had a little bit of trouble installing mine - I couldn't get it to instally "tightly" against the floor without sort of micky-mousing it in place while I had my center console removed for my B&M install. Any tips on properly installing one of these, besides the simple instructions that come with it?