Right, 500 miles in a day then another 300 the following day using the Airhawk inflatable cushion thing. I've got to say, its really good. The limiting factor now is the pain i get from my pelvis where i broke it at Mallory about 15 years ago. I could never ride far enough for it to really kick in before, the pain from my arse always forced me to stop first. Now 160 mile non stop runs are ok.
You don't have to blow them up very much at all to get the comfort, it fact it feels flat. but once you are sat on it and get the inflation just right its bloody great. I'm going to ask him to sell it to me.
The best comfort thing ive ever used.