That's disappointing to hear. I have two Yakima crossbars waiting to install but haven't gotten the towers yet... The clip system did look a little awkward, was that the reason they were difficult?
A couple things. First, I have the roundbars (I've had them forever, so didn't want to invest in new crossbars). The adapters for the roundbars don't install in quite the way the instructions say to do it and you have to awkwardly get the adapters partially tightened, then slide the bars through, then tighten them all the way from underneath while keeping them upright and without having them move their positions. It's hard to describe, but it's a balancing act. That alone wouldn't have been so bad, because you only have to do it once, but...
Second, the mounting clips. On my old car, I had Yakima's old Q-tower system that attached to the tops of the door frames (4 doors). Once you had those all put together you could just flip one piece on each up and down by hand to mount or unmount the towers. I had a system where I placed a little piece of electrical tape within the door frame (hidden with the doors closed) where the towers go and I could just take them on and off with one little flick of that piece.
On this system, there are metal clips on either side of each tower that clamp to the roof rails. These clips just slide into place and sit loosely on metal pieces on the tower until you tighten them down to the roof rails with the (provided) allen wrench driver. This means that those clips can *very* easily be knocked/jostled out of position as you're adjusting the placement of the towers before you can tighten them down and they just fall off. I won't say the number of times one of the clips fell off while I was repositioning a tower and clanged down the side of my car causing some choice words to fall out of my mouth.

Then, in order to tighten (and therefore loosen) the towers, you have to use the allen wrench driver, so not like the previous system where I could just flip up/down a piece by hand. I was hoping I'd be able to do something similar to the old system where I could put a nearly invisible piece of tape on the roof rails to mark proper placement and be able to take the racks off and on on a whim, but obviously that's not happening.
The bottom line is I'm a few hundred bucks into this system, so I'm not going to be switching to something else, but if I had it to do over again, I'd find something easier to mount/unmount. I use my racks pretty frequently to carry my canoe, so it's definitely not worth the hassle to take them off with this system.