It takes a brave man/woman to spend two thousand or more dollars on an item that they have never actually seen/tried. Patience...
I personally will not buy one until I can see one first, and read the opinions of the fine folks here.
Having said all that, I did buy a car once without ever driving a model like it (I did sit in one first). This decision was based on purely on the reputation of Toyota, and the total disregard for car salespeople. I got lucky and still like it 7 years later. YMMV.
I suspect that some buyers of DLP technology buy sets without seeing one first, only to be disappointed that they see rainbows.
Yet another consideration is the example of the Dell 42" TV. I almost bought one, but cancelled when I started seeing reports of problems. It might be prudent to wait until people live with them for a month or two.
My $.02 worth.
My current KS800 settings. PM:Movie, BL:13, B:45, C:85, S:0, C:40, T:G48/R52, DCV:Off, AMP:Off, SLED:Low, FM:Auto1, BL: Auto, DC:Off, CT:Warm1, Gam:0, CS:Auto