Edit: should maybe mention its a 7D i use for the marathons 
Which ones do you guys use and recommend. Ive been on ebay and i get the feeling most of them are all identical.
The only reason im asking is i picked one up from ebay a few weeks back as i use grips for shooting for marathon-photos but the one i got was faulty, they gave me a refund so im looking again.
theres ones for £40 and theres ones for £70. I dont really want to pick up the original one, all i really want is one that does the job 
So if anyone in the UK has a third party one id appreciate some feedback.
Cheers

