None of those extras are anything I want or need, however for $15 I'll take a Roadkill Rodney just for building out a display. The ninja stuff doesn't do much for me. The electronic/laser sword looking thing is alright, honestly I'd probably just leave it on Donnie's workbench if I had one for him. I thought it was kinda cool that he used a motorcycle brake handle for the switch for it though.
I somewhat wish all the turtles ended up being the same skintone as being able to swap all their faces and expressions would really open up a lot of possibilities for looks for many. I feel like Leo needs a gritted teeth look, and that yelling head would look great with Raph's top bandana-ed portion of the head able to swap onto for a raged-out looking shot.
I'd probably suggest most just get the timed edition. If you're not opposed to taking the time to sell the accessories, I'd imagine you'll make much more than $15 back on each of them, which would defray some of the high overall cost of the figure.