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Are they any good? Or am I better off with just a normal one
Lezyne make good stuff - I had their digital pressure drive for my last big race - it is tiny, efficient and more importantly, still in perfect working order!
http://www.lezyne.com/product-hpumps-hp-digipressdrive.php#.WcksUMiGM2w
I had a different makers version of this for other events - this digital display is so much better than the 'in line' method.
Not sure if this link works.....
I've the digital one for my fat bike, where 1psi can make a big difference in ride quality. But TBH I wouldn't bother if it were a regular mtb.
I find the Lezyne pump head is prone to unscrewing valve cores. So whilst I like the digital pressure gauge I don't use it as much as I should.