Here in the USA, I have purchased many items from RS (solderless breadboards, mini-boards, battery clips, diodes, voltage regulators, fuses and holders, switches, LED's, DTV converter box, the list goes on) and never had a problem with quality. They might be priced higher than Jameco, Mouser and/or Digikey, but they are local so you don't have to wait a week or pay for shipping.
My main problem with RS has been that too often the item is out of stock. But the sales people have always volunteered to call another store to see if they have it.
creakndale