I'm finally getting one!
https://www.ebay.co.uk/itm/356059248000The only reason I didn't get one sooner is that I don't have an Amazon account. But now it's on eBay I can buy one.
And it'll be here in a few days. I've been concern my XBox 360 controller has been getting on a bit, what with its drifty right stick, rattling sound and original Sonic Generations no longer running due to controller collaboration. I was concerned it maybe the same issue once Sonic X Shadow Generations was release. No point in purchasing the early release if I can't play it.
Not only that, but I can finally play Sonic Superstars. I couldn't before because I got stuck on the first Emerald Power tutorial due to my drifty analogue stick.