RGB to Scart works great on my 42" Samsung Series 4 plasma and Series 5 50" plasma.
Also works very well on my 22" Samsung LCD TV/monitor - although the screen does wiggle a little bit at times - probably due to the rats nest of wiring and power cabling from my PC. I'll probably tidy up the cabling sometime and make a new RGB to scart lead with a choke to see if that improves things.