Just to throw it out there. Alpine Stars quality is about 20 steps below Sidi in every way. Granted I am mainly referring to track boots versus street boots, but I bet the apple doesn't fall too far from those respective trees
I have owned multiple pairs of both brands and the AlpineStars have fallen apart in record time.
My Biaggi replica's literally had the sole just fall off the fuckin boot while out riding around on the track!
and my current pair of Alpine stars boots have a piss poor design on the zipper that curves across the foot and the velcro etc is just sub-par all the way around. My wife had some AlpineStars paddock shoes that didn't last very long either and those were just used for spectating at various Laguna Seca events
Meanwhile I finally retired a pair of Sidi's that I had bought back in 1997 in 2007 after using them 40-50 events per season even in rain conditions where at the end of the session I would pour the water out of the boot. Hell I even mowed the yard in them once and walked in them all over the USA on Motorcycle Tours.
They were the pair on the left
I replaced them with the pair on the right and didn't like the fit so I switched to Oxtar and have gone through several sets of them now too. They are pretty good value as long as you are getting a deal on them. They are not worth MSRP...
I currently still have a set of the Oxtars in grey that are about 8 years old and have survived a few crashes too I might add and I was just wearing them last Weekend and the Monday prior at the track because I'm just not happy with my current Alpinestars SMX series