I thought they used the aerow in the premiership?
Im pretty sure its the same ball - its not the 'normal' Total 90 ball
Nike outlet mall near where I live reduced from £60 hence why so cheap.
It is the same ball in design, just not quality. You would need to play with them both to tell the difference tho. I played with one of the old mitre premier league balls once, the proper version, best ball i've ever used by a mile.
I'm sure you'll find the 'cheap' version more than adequate. Personally i'd never spend 60 notes on a footie and if i did i'd only use it on grass
EDIT
The aerow 90 is the official prem league ball, in which case 17 quid is a steal, you should have got a couple never mind just one!!