So far I haven’t had any issues with any orders I made with SVP, so can’t comment on their customer service. The only e-mail I sent was asking if they ship to Ireland following the EU shipping restriction and they replied later that day confirming that they still ship to Ireland. As a few mentioned above, they are one of the few that list their disc’s MIDs, which is very useful when looking for media made by specific manufacturers, such as Taiyo Yuden.
I do find that they don’t use as much cushioning as other suppliers, which pretty much explains why some end up with damaged goods. On the other hand, I do know some other suppliers that go extreme, e.g. VikingDirect Ireland which has sent us a couple of stationary products (sticky notes, pens, A4 paper, etc.) in a package a little larger than a typical desktop PC!
For speed, they are pretty quick from what I recall, taking 2 to 3 days for a product to arrive after the date of ordering. Most UK based companies that deliver to Ireland take 4 to 5 days for the product to arrive.