I've found that they are all much the same really, just make sure you follow the previous tips on prep and getting the water up.
I've got some pretty good results in the past, a lot cheaper than a new carpet too.
This might help.
http://www.brandonhire.co.uk/springdeals
I'm having to tackle a couple of 'projects' this Easter break and wondered where's the best place to hire a floor sander and power washer? Who's the cheapest at the moment, anyone know?