There's no way a Viewlix weighs 250 lbs. I was playing on one not too long ago and it wobbled around just from normal usage. It definitely weighed less than my Blast City. It's basically just a frame, CP and flat panel monitor. I've also seen inside one and it's pretty straight forward.
Googled it and I saw weight specs depending on Vewlix model listed between 105 - 120 kg, which is between 231 - 264 lbs.
The Nova Blast not only weighs much less (IIRC around 115lbs total with top and bottom sections), but is modular and easy to take apart and transport. And personally I wouldn't want a 16:9 arcade cabinet. I prefer 4:3. There are legit reasons why some people will choose the Unico for their homes over other options.
I also saw a reference to having a cabinet in the garage. Not everyone wants to do that, not to mention not everyone lives in a house much less has a garage. Options are good.
In my own case, I have my main computer/gaming room upstairs, and no way am I gonna bring a 250lb Vewlix up here even if I wanted one. I already have a multicade in a Namco style cabinet with 19" vertical CRT inside and that barely made it up. Barely. The Nova Blast is gonna be a complement to that cabinet, and will be my horizontal 4:3 cabinet. I've looked at Arcade1ups as a cheap option but after seeing them in person... no.