It is all about personal preferance , and every kite is weighted towards an area of performance .
As far as pushing new design , the wing tips that are on the new F1's was introduced by Flexifoil a couple of years ago .
One pump , recon and the 5th line are features that don't increase performance but are a bit like 4 wheel steering on cars and parking sensors , nice to have . 5th line and recon are good safety systems , but still do have a few drawbacks .
If you want raw performance try the Lift pro , this kite has been rated as the highest performance kite available on the market by different mags around the world .
User friendly kites that are simple to use with out a lot of clutter that can cause other problems is my personal preferance as I tend to use my gear a lot

and don't always pull off what I am trying

.
The new 05 kites from Airush are all very "user friendly" and the progression made is a better balance of usable performance and handeling . Like improving suspension , ABS braking and traction controle rather than just putting more HP under the hood .All these things let you concentrate on what you want to do rather than on what the kite is doing .
As far as the bad warranties go , it happened and I will leave it at that .