The tech is still really new, and the reviews are quite mixed (looks like one of those marmite toys you either love or are unimpressed by sadly). Hopefully more like it come out in the future. I agree, theres a massive market there, it always feels rather unfair there isnt more variety on offer.
From what ive read the ion just has a nozzel like a womaniser that presses against the frenulum, so if you could always try lubing up the nozzle on yours and letting him have a go. 
Although alot of vibes are great for anyone to be honest. (There is a thread about it floating around). Alot of people on here use pebbles vibes, bullets and wands as well as strokers and things
Edit - Found it 