The hair growing back would cause all sorts of annoyance.
I have never waxed, but the way I understand it is you don't get this as it is "new" hair that grows back, which, even if you didn't wax, would grow anyway.
At the end of the day, it's upto to you what you do, I've often toyed with the idea of waxing, but never gone through with it, I just end up trimming/shaving.
Edit: I use a Phillips Bodygroom TT2030 which does a good job.