I have a couple of interesting monitors relevant to this discussion.
First is my GDM 5410
See it's specs here and a picture here:
http://www.accurateit.com/details.asp?iid=35The MultiScan Total Flat Screen FD Trinitron GDM-5410 SUN X7136A is ideal for the home or the office requiring exceptional image performance, without sacrificing value or reliability. The totally flat, high-resolution FD Trinitron CRT allow the GDM-5410 to perform at a level that will set a new benchmark for your expectations of clarity and color. The GDM-5410 screen features a high-contrast black coating. This coating coupled with the display's flat screen, also helps cut glare and washout caused by ambient light.
-Dot Pitch .24 mm
-Viewable Size: 19.8"
-HSCAN: 30-121Khz
-VSCAN: 48-160Hz
-Resolution: 1880x1400 85Hz,2048x1536 max
-Platforms: Mac and PC
-Signal Input: 1st VGA; 2nd DB13W3
-Power Supply: 100-260VAC
-Dimensions w x h x d: 19.72 in x 19.60 in x 19.60 in
-Weight 71.65 lbs
I have run 240 line games on it in 31/120 modes on it a few times. It does not look good. As Monmothma said, the scanlines are way too pronounced. The combination of stripe pitch and 24mm scanlines makes it look like you are playing MS Paint through a screen door most of the time.
However, I also have this monitor:
Mitsubishi Diamondscan 20m
.31 dot pitch
Max Resolution: 800 x 600
Sync Type: Composite, Seperate
H Freq/ V Freq: 15-38 Khz / 45-90 Hz
and games on it look absolutely fantastic. Yes, the scanlines are still pretty apparent on any game past around 90 or so, but no more than a good quality new arcade monitor has now. And they don't bother me. I'll take the trade for the amazing color and contrast quality.
I'll try to have some pics up of each in action in a bit.
Hunks Vivitron is supposed to have a stripe pitch of .28 mm, so I bet it will be a very nice monitor for a cab once he gets it working correctly.