Having seen a lot of feedback on their service on Missing Lynx, the consensus is that their service to the States is very good indeed. The only criticism I can see, is that sometimes postage can work out quite expensive...
This however is a question of swings and roundabouts - I buy a lot of books from them and no, their postage ISN'T the cheapest. That said, there are products which AREN'T available anywhere else and the 'base cost' of some of the products they distribute is so cheap its unbelievable..
The strange thing about Jadar is their on-line shop is infinitely better than their retail store...