Bought these to do a century ride based on GCN and other's suggestion that latex tubes do make a difference. My anecdotal experience - with the caveat that it could be all in my head - is that they do! Ride does seem seem a bit more compliant/comfortable. Quality appears to be excellent. Worth giving them a try!
The Vittoria Latex tube is a performance inner tube, best paired with supple performance clincher. I like the fact that there is no seam. You will need to add air before each ride, but that is a small inconvenience compared to the improved feel and performance achieved with this latex tube.
It maybe a placebo effect, but compared to the butyl it replaced, these latex tubes make it feel like I have a tail wind. I've maybe 400 miles on them now, on disc brake rims, with no troubles. I used lots of talc.