Revtek's coilovers, just like Toytec's BOSS 2.0" coilovers, are not "real" coilovers. They are simply Bilstein 5100 shocks with a threaded body in lieu of the spring seat grooves, pre-assembled with a spring and top hat. In other words, they aren't rebuildable and have poor heat management properties due to the steel 1.97" diameter body, so you will experience shock fade rather quickly. Overall durability is also questionable, especially if you opt for 700# springs.
I don't know what kind of price point the Revtek version comes in at, but Toytec charges almost $900 for theirs which is kind of insane considering you can put together almost the exact same thing without the preload ring using 5100s and OME or Eibach springs for around $400 if you re-use your stock top hats.