9-speed 12-27 cassette?

I'm on the lookout for a 9-speed 12-27 cassette, preferably sram. The only ones Ive found are BBB, they are cheap and on ebay and amazon. Any experience with BBB cassettes? Are they as bad as some of the Amazon reviews make out?
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If you want Sram it seems like the closest you can get is 12-26, which a few places have in stock around the £21 mark.
{edit} also looks like the BBB cassettes are loose/separate cogs - far easier for cleaning!