Daystate seem to be getting a bit of flack regarding their after sales these days, but my recent dealings with them have been nothing but positive.
I recently sent back one of my Mk4's which developed a leak and despite the fact I wasn't the original purchaser, they repaired it under warranty and turned it around within two weeks without it costing me a penny. My telephone queries were dealt with in a very friendly and courteous manner, really I couldn't fault them in any way.
Superb customer service and lovely rifles.