Quaife shifter?

[robdog98]

Any one ever purchase one of these shifters?
http://www.burtonpower.com/parts-by-category/transmission-clutch-wheels/quickshift-levers-kits/quaife-quickshift-gear-lever-4-speed-rocket-qs02.html

Need a new one for my Pro 4 and was if they are worth the investment?

Thanks