I have the 2002 Oxtar Evo Ti Boot, with TCS and MCS technology. Basically, it's the same (I think it's a little better) as the SIDI vertebra system. Same concept anyway. They fit really well, but are a little hard on the sole...but I think all boots are like that. I think I just need to break them in some more. They have titanium toe sliders, which is pretty cool I guess. They don't squeek when you walk, and they look pretty damn sweet in my opinion.
I've had my Oxter EVO Ti's for about 8 months. Great boots and and very comfy. Make sure you put blue lock tight on the toe slider screws. They will vibrate out. Other than that great boots and quality is very good.
I recently ordered and received a pair of the Oxtar TCS Evo Ti's and haven't had a chance to ride with them yet. That being said, I've been wearing them around my house and find them to be incredibly comfortable. As I have a wide foot, I was really pleased with the fit of the boot and the width of the front of the boot. Most boots I've owned were a little narrow, but not these. If the rest of their line of boots fits like this, I'll be getting more of them. I'm also very impressed with the overall quality of the boots. They are really a well made boot, look great and as I said, incredibly comfortable. I will update this in a few months after I've had a chance to wear them.
Love my TCS's. Got 'em on clearance at motorycyclesuperstore.com I think for ~$130 ish. Big improvement in protective qualities over my previous JR Revolution with a slight drop in comfort. Breathe very well for a non-perfed boot IMO, but still fine down to the 40's for this thin-blooded northerner. Definite thumbs up in construction quality.
I also got the TCS sport from motorcyclecloseouts. I wouldn't want to have to walk much, but they are comfortable enough. Great feeling on the bike. But this is my first bike and first pair of boots so I don't have anything to compare to except my hiking boots that I used for the BRC course.
I have the TCS sport boot and absolutely love it. I paid $119 from motorcyclecloseouts. The only complaint is that the sole doesn't have much cushioning but some gel inserts will solve that if it bothers you too much.