loup: A friend of mine did the mods for me. He's much handier with the dremmel. He told me it was easy though. Just in case, I ordered two extra front cases off of the tunze website for like $10 each and my friend modded those ones. So I still have my original un-modded front cases if I need them. And I agree with you about the vortech (I've never had one, but I've seen them).
eagleONE: One of my 6025's seems to have some trouble starting up occasionally. I have them on 15 minute on/off timers... occasionally, 1 of them will take maybe 5 minutes to start going. This probably happens once per day. And there is a little bit of clicking during start up for mine because of the mods. I have the 'stopper' mod, so it's like an mjmod with a little stopper to stop the propeller from spinning backwards. The noise is definitely not significant in my opinion though. It lasts for less than a second, then when they're running they're virtually silent.