I've ordered from RC Mart many times now, and never had a problem. Always had parts in stock, and seem to be quick with postage and so on.
Never noticed any extra fee's either, plus, importantly, they mark down the parcels by enough so that I avoid custom's charges this side.
If anything, I've had worse experience with Rc Champ recently... The order for my 416 took a lot longer than it should have done, one of the parts ordered was missing, and got hammered on customs... go figure. They are cheaper than a lot of other places though, but thats fully negated if you paypal and customs charges on top...
Sufice to say, having run a Tamiya for many years now, I'm pretty damm proficent in ordering stuff from abroad, and have had no issues what so ever with RC mart...Plus they included a very useful little LED tourch with my last order over christmas... FOC
Top abroad shops for me are (in no particular order)
Speedtech RC
Rainbow Ten
RC Champ
Precision RC
RC Mart
Stormer Hobbies
I've also placed my first order with RC Market, so far so good, parts should be due to arrive this week.
Regards
Ed