True about the sliders - that's been my biggest bug bear so far. Even though JCR said they made some - I ordered some and they didn't fit and JCR gave up answering my questions as to how to get it to work. There is someone on Naxja who has them installed but even he couldn't answer my questions. I can modify them with some work - but I shouldn't have to.
Other than that I am loving the kit - rides really well on my DD and I have over 40K miles on it in the last 16months. I haven't done any serious crawling in rocks or anything though. Anyways it seems in serious stuff you'll be dragging metal - whether its frame rails, rock rails, roof gutters, or quarter panels.
However I was a complete noob when I bought it and I didn't know anything about TnT or Clayton...