The slow delivery is because they are based in the Channel Islands. They use modern technology (email) to take your order but, to keep costs low, they use an almost prehistoric ferry to transport to the mainland.
They are reliable, I use them often but, give them time to deliver:-))
You are dead right they are slow, but if you are not in a hurry then I doubt if you will find cheaper on most things. Channel Islands mean no VAT.which has got to be good. I also find them to be very reliable but as I say dont be in a hurry.