I was skeptical at first, especially when it was first introduced. Its 2nd generation seems to work better. This has now lead us to the current situation in which one karter says “I’ve heard/seen good things,” when the next karter says the opposite. Frankly, the only way to put the matter to bed is to run it. Now that USPKS will do just that next year solves that issue. All we have to do is watch how it plays out. Everything else is, effectively, is conjecture.