i had 5:10's – they're good, but they hold on to lots of water, take an age to dry, and then they fell apart.
i've now got Shimano am40's, they're not quite as good in terms of 'feel and grip' – about 80% of what the 5:10's offer. But they don't soak up as much water, they dry quicker, and they've lasted LOOOAAAADDS longer.
oh and the lace-cover flap thing is really handy for keeping your laces clean / dry – i appreciate this.
if i had to buy another pair tomorrow, i would really have to think about it, and then i'd get the shimano's, no, wait, yes. probably…
the 'original' 5:10's are lined with cardboard, this is a crap idea. i will not buy another pair until they've changed it.