I just experienced my first ever flight in Stretch Seat and I'm very happy about it. It was DEN-LGA, thus about 4 hours on the plane (3h05' flying time). I'm 6'7" and this was really wonderful for me and I will always go for it, from now on. In fact I find it a considerable advantage compared to other airlines (perhaps with the exception of JetBlue, they have greater legspace even in the back and a similar offer).

Now, I booked it through a Classic Plus ticket, because I needed fully flexible conditions and the surcharge was less than the potential 25 USD same day change fee on Classic. I also enjoyed the complementary wine - but you can also buy it for 5 USD, thus that's not really the winning argument for it.

Thus I will go for Stretch Seating in any case, through a Classic Plus ticket if I need the full flexibility and surcharge against classic is less than 25 USD.