I bought my boat and etec 50 hp as a pkg deal. I didn't specifically want an E-Tec, but I got a smoking deal on the package. After three seasons of using the motor I've found it to have some positives and negitives.
positives: runs great, torquey, responsive, very good fuel economy, uses very little ob oil
negitives: if you troll alot with it at low rpm it tends to foul spark plugs (I've had to change them twice a fishing season May through October.)
If I do ever need to repower, I won't go with the E-Tec again, I'll go with a yamaha 4 stroke.