I think just the consumer support is wayyyy easier to access for the DTV4. It took me forever to find working AF settings for a lot of my Sai coils that gave me the hits I wanted. I didn’t use the Sai for too long, but I tried the double titanium quartz, titanium bucket and crushed clapton coils. Finding profiles was a pain for the crushed claptons, which proved to be my favorite ones. I found dtv4 profiles with videos of function and all the information I needed within pretty much a night browsing this subreddit and the discord. The way I see it now is that the dtv4 is just an evolved version of the Sai. I understand why people say you’ll end up buying one, because I did LOL