Just put in about 100' of it at my Dad's place. It really is simple and pretty quick. Hardest part was dremeling out the rivets to remove the corner splash guards, or whatever you call them. No good way to put them back, so I left them off.
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Parts of it took a little work to pry up underneath with a putty knife, but I just waited until the sun warmed that part, and it was a breeze then. It was a little tricky getting them under a corner like that one with the 45 degree shingle in there, but the straightaways take only minutes each. Reading what you just posted, I maybe should've ordered the brush. Of course, he doesn't get near the mess you do, but it'd probably make things easier.
Glad you posted the review - he was gonna pay a company to install something for probably 5-10 times what it cost me to put some in. Now I have to figure out how to hire someone who'd do a good job putting mine in. Too much of it, and way too high for an old guy like me. My 2-3 story ladder days are over.