I had a quick look at the Nexion in Planet last week, its cheap and nasty.
The guy in Planet said himself that there was little difference between the Nexion and the Spyder which is £100 cheaper.
I don't really like the Impulse but its a far better buy than the Nexion.
If you are on a limited budget then buy second hand. My lad bought a good second hand Angel with air system for £300!