My loooong-serving "Formac Gallery 2010" display finally keeled over and died. I need a replacement for a dual-monitor setup. The simple solution would be to buy a new display. However my iMac will need upgrading soon anyway so maybe I should take this opportunity to get a new one and use my existing iMac in Target Display Mode as a second display. My question is, is this viable for long-term use? Any caveats and gotchas I should be aware of? I'd need it to behave just like a second display in all respects other than that it has a (potentially useful) second Mac inside it. I rarely shut down or restart my MAc but I'm concerned that sleep/wake behaviour might be odd, and specifically that the desktops I have set up (with specific window and palette arrangements across both displays) would get frequently reset to a single display layout. This would drive me crazy and I suspect it's likely anyone had experience trying this sort of setup for regular use?