i suggest you download the 30 day trials and go from there. i love flash. the new version of flash is great for the visuals because of the new adobe added layer effects. for code, there is a it script assist? thing. its like older versions of flash and it helps you fill in the blanks... i dont use it because as i recall the older ones were very limiting. i dont really want to list all of the amazing features because macromedia's marketing department did a great job on their website
. pretty much in the end its up to you. is it worth the added features compared to the cost? can you expect you customers to be happy with downloading a new flash player? does you current version work fine? (because if it does you are better off sticking with what works... if it aint broke, dont fix it).
people often get caught up in learning new technology when they should be perfecting the old ones. (that was a general statement, not directed towards you)