361° Mega 3 Pro sizing?

I'd appreciate hearing from Mega 3 Pro runners on how true to size their shoe runs in terms of length. I'm not concerned with width (my feet are narrow) but only length. One reason I'm asking is that I found the 361° Flame 5 to run slightly longer than TTS where the older 361° Flame 4 ran TTS. I'm a 10.5 in most shoes and need to choose between 10 and 11 for the Mega 3 Pro. Thanks for any comments!

(update: thanks for all the comments - I ordered a size 10 and we'll see how that works)