I've placed two orders with them because I like the lay out of their website, with a good selection and good online prices. However, they didn't fulfil either order entirely. When items were out of stock, they didn't bother to inform me until I chased them with telephone calls. After one such enquiry, when I pressed hard for information! I was told the Thermatex I ordered would be delivered in about three weeks. Two months later, I cancelled it!
I'm afraid the service is just too poor for me. I have been a fan of Derby House until this past 10 days when they sent me the same item wrongly twice - it was mis-labelled. Wouldn't you think when I returned it explaining that, it might have ocurred to them that a batch may have been mis-labelled and they would check the second one they were sending to me

Its the only error they have made in many orders though, but so stupid! I'm past caring now and have cancelled it. This means I have payed £4.95 p&p for a grooming spray and a £0.50p mane comb
If they have what you want, you can't beat Rideaway really. The prices are good and you see online what is instock before placing the order.