All I can say is WOW! I've read here that you can get good results with your eyeballs and programs like Quick Gamma from the Norm Koren website, but after playing with that and Adobe Gamma I got myself so screwed up, nothing looked right.
Granted I'm going to be 50 this year and my eyes are getting a little tired, but I decided to spend $220 on the Monaco OptixXR Pro, and did that change things from what I got using Quick Gamma! I finally figured out how to batch process in my new PSE4 program and ran the DryCreek Photo free conversion program using the profile for my local Costco Noritsu unit, and the results are truly eye-popping!
I'm not saying you cannot get decent results with your eyeball 'calibration', but you won't know what you're missing until you have calibration at both ends of your process. I look at what we spend on our gear in the lens and flash forums, and I'll admit I didn't want to spend the bucks on a colorimeter (since getting my digital camera this hobby has become a black hole to throw money into!), but if we're going to spend a couple large on equipment (or more!) I think it's penny-wise but pound-foolish to not get a colorimeter. The results are simply that amazing.
I don't know diddly about brands of colorimeters, Colorvision, Monaco, GretagMacbeth. . .but I suspect it really doesn't matter a lot. Any of these devices is going to improve your enjoyment of your finished prints by several orders of magnitude.
Before your next lens purchase, or studio light, or upgraded 'fancy' camera bag, or extra couple of flash cards. . .do yourself a BIG favor and put that on hold until you get a colorimeter. You'll be happy you did.
I'd be curious to see what other folks experience has been after getting a colorimeter. To you folks that think you're doing just fine without one, all I can say is I thought my prints improved when I used Quick Gamma by eye and the DryCreek profile. But I was wrong!
I was a big film guy and darkroom enthusiast in my youth. As I learn more about digital photography (I'm between ankle and knee-deep, I think), as I go through the pain of learning all the programs and the process--I just cannot imagine anything sillier than not having a colorimeter.
Like they say on the Nike commercials. . .Just Do It!
John

