i have, i bought a Chub outkast off them, i ordered a 2.75, when it arrived i put it away with the rest of my Outkasts and didnt get it out for over a month.
When i did get it out i noticed it was a 3 and not a 2.75, i contacted them and they replaced it free of charge (even though this is against their own returns policy as i had waited so long) so they get a nice big green tick from me, iwould use them again if they ever had a good deal that i actually wanted 
I wouldn't touch them with a barge pole, yes they do sell a lot but if they can't deliver.
I have noticed all these big shops that have flooded Ebay all have a lot of bad feed back, if they can't cope with the demand then they should cut back or get off.
I sell on ebay at the rate of about 100+ items a month which I can cope with. I always check for messages and reply as soon as possible, and if there is a problem with an Item I try to sort it as soon as possible.
I have a feed back of over 1400 and that only includes one negative from a buyer who never told me of a problem waited for about two months then left negative feed back
all i can say at this moment is that they took my money sent no goods to the discription wont deliver and wont give my money back i lernt the hard way buying off ebay but not all seller are like them thank god
A friend of mine used them and got a Maver Armageddon for 800 (500 to 700 less than online prices) with dvd, cups and 200 pole rigs. Got the pole very quickly but is still waiting for the rest of the stuff although he did phone them and he said they were very apologetic over the phone and would get it sorted.