Last summer, when Sports Direct in the UK had some ridiculous deals on Slazenger Wimbledon balls I purchased a very large quantity. I'm now down to my last 4 tubes! The balls have lasted well and at around £1 a ball they've been very good value. However, when playing on UK hardcourts, they seem a little on the slow side. Durability aside, in your experience - what are the fasted brand name balls for hardcourts?