All the skid systems flat out suck! There... I said it, since no one else will. Of course, if you aren't really seeing this with your aftermarket skids, I'd say the stock ones would have done you just fine, with the addition of a 'skin' for your evap and oil pan.
Now.... that being said, most of the skids out there are okay, with a little help.
What needs to be done to ALL of the skid systems (manufactures, are you reading?), is to add cross stiffeners. If you don't, you'll quickly see these nice skids turn into concaved messes.
Then.... a necessary addition is the little bolt protectors that RockHard provides with it's skid system. Otherwise.... goo luck getting those bolts out when you need to. Might be easy work in a shop with the proper tools, but on the trail.... big problem!! These little fuckers are 15 bucks each.... so add that to the total of whomever you go with (unless it is the Rockhard skid, as they come with them).
I run the Treks product.... have seen a lot of issues and a couple of redesigns. With all the redesigns, it isn't a bad system if you add the Rockhard bolt skids and cross stiffeners. I really like how Bob, the owner of Treks, listens and updates the design after real world reports from the field. Kudos to him for that! (although I haven't seen a bolt skid (maybe patented by Rockhard?), nor do I believe he's incorporated cross stiffeners yet.
If I was to repurchase today.... hands down the Rockhard, as it is the only one that gives the bolt skids in the price, the other kits you have to add it as an extra. Although I do like the Poly product too.... it looks STOUT with it's crossmember.