Since I use a plasma for my retro gaming, I use a scan converter. Up until yesterday, I've used an iScan HD unit with an SLG3000 scanline generator. It was decent, but it added a few frames of delay, so I replaced it.
This Framemeister is awesome. It has a few odd quirks, but everything looks fantastic and my delay worries are over. However, I hated the cheap plastic toy enclosure it came with... so I decided on doing this:
The 19" rack mount chassis was donated from an audio processor for some Yorkville PA that no longer exists.
The 4 BNC connectors are for RGB+Sync and I have to add 2 more for S-Video once they arrive in the mail.
The only complaint I have so far is that when I'm using scanlines with my MVS, it tends to mess up a couple lines; works perfect without the scanlines. Maybe there's a setting buried in this thing somewhere... or maybe I can come up with another solution.
The pictures hardly do it justice, but I'll post some anyhow. SNES is just an SNES-1 (BA6594AF encoder), MVS is an MV-1C, Genesis is a VA6. All consoles are NTSC and using RGB+Sync. TV is an LG 52" Plasma.