I have used P2 (sample bottle). It is fine but does need spritzing with water however the finish is good. Megs 205, Optimum and Menz are easier to use as the process of spraying water can become frustrating.
I should add that I have no idea if the polish has been updated as the P2 I used was from around mid 2011
To finish out just the sides of the Impala we used M101 with Orange Hybrid Foam Cutting pads on the Flex 3401 and then re-polished using the new Gtechniq P2 Jewelling Polish with some prototype gold jewelling pads on the Flex PE14 Rotary Buffer. Then we waxed the Impala with Max Wax Paste by machine.
I thought it worked great and if I remember correctly Robert thought the same thing...