Hi happyal
I've had a number of Wot4s (see my profile and review) - I love them. I've had all 3 marks in various states of modification.

If you're going to go for that choice I would, if I may be so bold, offer just a couple of tips:

1) keep the motor size down - say a 40 maximum.
2) keep the aileron rates low.

I fly with one with an OS46FX and with large throws it will roll very fast (say a couple of rolls per second) and will vertical climb from take-off to out of sight in 20~25 seconds. I would say that both characteristics are way too much for a beginner to learn on

Other than that, I think it is a fine model and can be re-engined later when he has got the hang of it I had a 40 powered mk2 as my second model - hope your son gets as many hours of enjoyable flying out of it as I have mine.

cheers
Rick