On my P150, I started out with no windshield, then added one after I had it for 3 months. From my experience, it makes a BIG difference in comfort level. All that wind is going to either hit you or the windshield, so it might as well not hit you in the chest all the time. And a windshield can also deflect a LOT of bugs that would otherwise hit you - I'm constantly amazed at how many bugs are plastered on my windshield, and some of the bigger ones would have really hurt had they plowed into me at 40 or 50 mph. A windshield will also push the air up over your head, not into it. Probably the biggest reason I got one, though, is that it keeps you so much warmer when you ride in colder weather. All in all, so many positive reasons to put one on your P150, no matter which one you get. Just my two cents worth.