Hi Mark,
You may or may not remember me, we exchanged a PM last year when you first got your Z520 and I mentioned the 4 blade PowerTech prop Steve set me up with which I really like on my ETEC 250. Well my #2 piston blew on Pines 5 weeks ago, I should get her back from Rockwall Marine this week. I love the engine and have been just as impressed with it as yourself, however, I am thinking to get another boat with a Merc. My thoughts to sell are mainly due to the overwhelming negativity held against ETECs, mostly unwarranted, while I may still be able to get a decent sell for my 2011. On the fence post, love it, but this is also the first engine I've blown in 27 years of having boats..