Having just completed another joyous round of disc golf with my Vibram Treksports, I feel the need to prop them up a bit. First, I'd like to state that I owned 2 pairs of KSOs before purchasing my Treksports and I manged to separate the mesh uppers from the polyamide lower material. As stated before, this may have been partially my fault as I used the KSO heavily in the gym and occasionally for Basketball. I don't think the KSOs were built to withstand the heavy lateral movements required in basketball, apparently a new model, the KOMODOSPORT, was built with lateral movement in mind. Either way, VFFs are not the best footwear for hooping.
On to the Treksports... I've owned my pair for about a month now and have ~5 rounds of golf on them. For disc golf, the Treksports are far superior to the KSO. The slightly thicker, slightly lugged sole offers a bit more protection and increased traction. Warning: KSOs are VERY slippery in wet grass / mud / etc.
The materials and construction of the Treksport also appear to be much more durable than the KSOs (only time will tell). The Treksports also have an soft Neoprene pad on the Achilles Tendon that helps to prevent abrasion. I didn't experience much discomfort with the backs of the KSO but the skin on my Achilles did get develop a bit of a callous. There is a downside to the increased padding, it also functions as a funnel for debris that will occasionally start to rub on the heel and cause discomfort.
Having upgraded from the KSO to the Treksport, the only feature I miss from the KSO is the minimalist sole for situations that do not require the extra beef. The more robust sole of the Treksport is thicker than the KSO causing it to be a bit stiffer. This does slightly take away from the "barefoot" experience but, only having money for one pair, I'm fine with loosing a tiny bit of feel for increased functionality. The price tag of the Treksport is also $15 more than the KSO ($100* compared to $85) but if the Treksport has a longer life span, I consider the $15 money well spent.
Any shoe in the VFF lineup will be closer to a barefoot experience than traditional uni-toe footwear. I love being barefoot and if there weren't rules and hazards prohibiting being barefoot, I'd do it all the time. If you feel the same about being barefoot, check out a pair of VFF, if not, don't. The KSO Trek looks like it would be great for disc golf as well but I'm afraid of being barefoot in leather shoes for long periods of time. VFF is coming out with a laced model (Speed) soon for those who want a more traditional look.KSOTreksportKSO TrekSpeed * I only paid $50 for my Treksports using my 20% REI member discount and my $31 dividend.