In his first review he had a picture of his d9200 running at 35kHz (i.e. 800x600). It's no longer there now, but it once was. I remember emailing him about it, and I got the distinct impression that he didn't realize that he was overclocking the monitor, which makes me suspect he'd always run it at 800x600.
Actually, I only ran it at 800x600 when setting up my MAME cab for the first time - WindowsXP automatically forced the display into 800x600 during the install process. I left it there to take a few snaps, then switched over to 640x480. I ran 800x600 a couple of time for tests, but never long term.
The board failed 2 weeks into ownership. I have no idea if it was connected to the 800x600 installation mode, but considering the system only ran for a couple of hours in that resolution, I doubt it.
As to some of the Betson Questions:
1. Official specs mention memory settings for 6 custom modes. I've found that I've been able to fine tweak all my AVGA-MAME games for size and it's remembered every setting.
2. The Service Manual (
http://www.retroblast.com/files/KT-XX14X-SM.pdf) lists what settings get saved on a per-mode setting, and which settings are "universal" across all the modes.
3. Another source for the Kortek Monitors in the US is the (ta-da!) Kortek USA branch:
http://www.casinotech.com/KortekHome.htmlA word of warning: they are not used to dealing with consumers, but rather arcade manufacturers. Still, they probably can get you the 19" version of the Kortek Multisync.
4. The Kortek site does list all the monitors as 2" bigger than they actually are. I suspect, as was mentioned here, that they are measuring by mounting space, not tube size.
5. A video review of the Betson is now online:
http://www.retroblast.com/video.html6. Yes, I do love this monitor. Especially now that I can use a light gun!

Kevin