Cheapest I've seen so far - if only by a couple quid. Not seen any reviews but I've ordered one so will post back when it arrives! Also seems to be the only "universal" guitar for Wii available in the UK. Here's the blurb:
Datel's SFG Guitar is the ultimate one-guitar-solution for all your guitar games on Wii or PS3!
It's fully wireless straight out of the box, and is compatible with all the top PlayStation 3 and Nintendo Wii guitar games, such as Rock Band and the Guitar Hero series so if you own both consoles or want a two-player guitar duel on your friend's console, it's ideal!
SFG Guitar has a detachable neck, so it's easy to store and transport. It comes supplied with a fully adjustable guitar strap and offers five fret buttons, five fret select buttons, a responsive strum bar and a working whammy bar. It takes two AA batteries.
* Fully wireless
* Rock Band and Guitar Hero compatible
* Five fret buttons and five fret select buttons
* Adjustable strap and detachable neck
* Sturdy, ergonomic design
* Strum and whammy bars
* Works perfectly on Sony PS3 and Nintendo Wii