I've never even tried V3. I only just (today) got my first saber with sound, and Emerald to boot, and since I was going big, I went V4 as well...and after finally playing around with the different sound banks that came preloaded, I know that I'll spring for V4 every time I order a saber with sound. Being able to change my sounds given just a few seconds to fiddle with it is just awesome, and being able to mute it is likewise.
Very, very happy that I got the V4.
This weekend, I'll start playing around with the launcher software and start looking into more fonts.
I'm in the same boat as you. I just received my first saber so I went all in also. I too really enjoy the bank switching with the AV switch. I wonder, does this work the same with the guarded switch?
I downloaded all of the website fonts and a bunch of the fonts from the forums. I went and previewed them and saved the lscfgx files so I don't have to add them sound by sound again. I do know i'll have to edit the bank sizes or remove some sounds from some of them once I go to upload them to the board.
I'm charging my batteries now so I can start changing the banks out on the saber itself. I really like to hear the hum loop to get a real feel of it. Maybe looping the audio preview will be a future update.
Then there's the next step of trying to make my own custom font.
I hope you're enjoying your saber as much as I. I'm really enjoying all of the customizing options. So worth ponying up for the works.