Any difference between brands of creatine?

[Krelian]

I just saw a bottle of generic creatine monohydrate (London Drugs brand) at London Drugs, and it was ultra-cheap. Would this stuff be OK to get, or would it be crappy quality? In other words, are all brands of creatine pretty much the same, or is it worth it to get a more well-known brand? If the latter, what kind would you recommend?

Cheers.