I would think you will get the newest software but you can always ask them (phone/email/facebook chat). I initially was not going to get the PAS either - they convinced me to try it. Now I cannot imagine riding without it. The joystick is quite tiny and imo not comfortable to hold for more than a quick boost. The PAS works quite simply and very well - the assist starts when you pedal and stops when you stop pedaling. You can turn it off (pause it, actually) with one button press on the handlebar controller and then resume it the same way. Here's my routine, maybe it will help you decide or maybe not. Turn on battery (press button), turn on handlebar controller (press button), turn on PAS (press face of PAS unit). Start riding. At that point, I can either up the assist level or pause the assist until I need it for a hill. Approach the hill, resume PAS with one button press -- or if you didn't have PAS, you would push and hold the tiny joystick. You do have fewer settings for power with the joystick (25, 50, 75, 100%) which is 4 levels; with PAS you actually have 9 levels of assist to choose from. I don't know if that will matter to you. Since you said you might want to use the motor on flats as well as hills, I highly recommend the PAS. If you are just going to use it for hills, you can probably get away with just the handelbar controller and joystick, but as I said, it's not something you are going to want to hold for distances on flats. There is a bit of a learning curve with the 1M, but several of us have had them now for a bit and are more than happy to help walk you through it.