I use VV n320 exclusively in my 9mm and 40cal loads. Sure the price per lb of powder is higher, but when less than a penny per round...it's worth it in my opinion.
Softer recoil, less flash and meters extremely well are my main reasons for using it.
Yes it does.
Which one you like will depend on your preferences...some change break while not effecting reset and vice versa.
The two I prefer and have narrowed down to over the years are the Glock oem "minus" and the TTI connectors.