Have had the 30670 for 2 months. Happy with it. Still have option with my vendor to upgrade to 50670 or 70670 when they are released. Not sure if I need to.
The quality of the 30670 is superb so not sure the 10 color is worth it for our clients. The speed is pretty much what Epson says it is. We have other printers for long banner runs so not sure we need the speed of the 50670.
Have had two service calls. First was for ink dropping off heads and second for bad alignment of the heavy duty takeup (recommend that option).
Strengths:
Superb quality
Ease of operation
Little maintenance
Once you get dialed in profiles and media feeds, it goes
Epson support has been great. Next day tech is on site with parts
Weaknesses
If any, when running at high speed, we use some BBC radiant dryers as the inks can still be slightly tacky (even with the big front dryer)
In short, was between this and a hp latex for our needs. Very satisfied so far.