Necro thread revival. Still have my VHS/Hellion. Figured I would share some additional thoughts after owning and shooting it for a couple years.
Things I didn't love about the stock gun:
1) length of pull. I"m 6 feet tall with long arms, I like the A2 length AR stock, and this is still...long.
2) safety. Using the stock BCM grip, its hard to reach.
3) magwell is incredibly narrow and already in a harder sport to use than a regular rifle.
4) trigger. It's a bullpup trigger. its perfectly serviceable but its not the best
Things I really did like about the rifle and why I kept it instead of trading it off:
1) Ambi everything is awesome, especially for a left eye dominant shooter like me
2) great accuracy, with both 55gr and 77gr
3) soft recoil impulse, reliable
4) suppressor setting. really nice to shoot suppressed with less gas impulse into the system. Works well.
There are aftermarket solutions to most of the problems I listed so I tried some. There are even aftermarket triggers out there but I don't hate the trigger enough and have heard sketchy reports on reliability so I kept that stock for now.
I did try out a smaller grip (Irregular Defense Special K) to make reaching the safety easier, a Lunar Concepts enhanced magwell, and a Manticore butt stock to reduce the length of pull.
With a few aftermarket parts of fix the problems I had, the VHS is a really solid rifle. I'm still a fan, after spending more time with it.