I have very large hands and the stock switch on the ELA V1 was really uncomfortable for me. Being as small as the entire assembly is on the heavyweight ELA, the
mod could barely tail stand and would fall over if I sneezed near it. Also, since the button hung below the horns, if I over tightened the extension tube, my ELA would fire if I set it down on the button, resulting in several melted insulators. I bought the flat button and have fallen back in love with my ELA V1.
The redesigned stock button on my ELA V2, on the other hand, fixes all of the things I had problems with on the original; David knocked it out of the park with this one! The large button perfectly accommodates my fingers, plus being large and flat/flush the
mod is is very stable standing up and has no chance to auto fire. Also, being larger, the new button is much easier to lock. I really love the redesigned button.
When I ordered my ELA V2, I decided not to get the flat button since a lot of the ELAs charm comes from the the unique button and locking mechanism. I felt that if I were to put a flat button on it, I might as well get a Telescopic Workhorse and save me some money.