i play 3 to 7 days a week 2.5 to 3.5 hours per session. i weigh 170 pounds and only play singles, 90% hard court. i do not wear my tennis shoes off of the tennis court AT ALL.
i used the previous version of the Nadal shoe (the one with the shadow dots all over), and it was the best shoe for this game i'd ever had. but there were some issues. i had some leg soreness that caused me to buy insoles. and, i was fiddling with these shoes constantly. always bent over on the court retying them, etc. but still, compared to what i used to wear these were a revelation.
then tried on the ski boot that is the barricade 6 and switched to that. once these are on, i never have to touch them again until it's time to take them off. custom insoles? what are those? forgot all about insoles after buying barricades. and the barricades are the best made upper of any shoe i've ever seen. the entire bottom of the sole can be worn through (which takes some doing) but wipe off the uppers with a little Woolite in warm water, and damned if they don't look brand new! i've never seen a more durable upper than the barricade. the laces are also superb and grippy. the area that the laces go through look distorted after a month on every other shoe, from the pulling. on the barricades they are as strong and straight as a bed frame.
no matter what to-class shoe i buy, under my playing style and conditions, they last almost exactly 4 months. i've never had a shoe warranty denied by TW.
get one of the top reviewed shoes. we all know what they are. if $ is an issue and you play often, get ones with the 6 mo warranty. this formula is the only way to go for a serious player.
once you have tried a top quality shoe, you will never ever be looking in the $60 and below levels again. trust me.
and if you are over 30 years old, then having quality shoes is much much more important than any other tennis equipment you own. if you want to continue playing this game.