I haven't tried the after market bearings that Mini Spares offer, I don't know if they are the same as the other after market stuff, for that matter, I don't even know what brand they are.
Like many others here, I have tried a few of the after market wheel bearings out there and had very disappointing experience with them, I think the best set went for about 2000 km, but the others, fronts and rears, usually have let go at less than 500 km.
If others are happy to fit the after market bearings, sure, knock your socks off. If anyone has had success with them over 10 000 km, sincerely, please let us know the brand and how you fitted them up. We may yet stand to learn something.
On another note, I've read a few disturbing posts in this thread, come on guys, it's only car parts, it's really not worth squabbling over. If some like Black Bearings and other like White, that's ace, fit what ever rings your bell. Timken are the only ones that have rung mine over the past 40 years, but, that's just my experience, not that I know much.