If you read the reviews they're generally positive, but the last 2 times I've used them they haven't been great - the first time I had to collect my drill from the delivery office; they close early (18:00) so I had to leave work early and get the train over the other side of the county because there were sewerage works blocking the most direct road in.
The last time I used them I paid by Paypal because I thought it would be easier, but Paypal automatically added my old address and they would not change it "for security reasons".
So "for security reasons" they had to deliver my socket set to my old address. There was nobody in and they left a card, then someone took the card to the delivery office and forged my signature to get a free socket set. Toolstop's attitude was that they had delivered it where it was supposed to go so tough luck. Paypal took the same line - it had been delivered so tough luck. I pointed out it hadn't actually been delivered anywhere and they gave me my money back.
Later on I found the same set on Amazon for roughly the same price.