If you, like me, are serious about photography and especially, about printing your own photographs you need to sink a few dollars (and lots of time) towards that objective. Perhaps the single most important step is calibrating your monitor, no matter where your photos are printed. I love to print my photographs at home on the Canon Pixma Pro9000 Mark II. Until recently, I had been using the "eye" method of calibration, resulting in prints that were, well, not good at all.
I finally decided to bite the bullet and invest in a calibration device. After a lot of research, went with the Spyder3Elite. (The
X-Rite Eye-One Display LT gets good reviews at other websites too, FYI).
The installation on Mac is reasonably straightforward. The device shipped with software version 3.4 (I think) which was a little buggy. Every now and then, completely at random, the "Next" button would disappear forcing a quit and relaunch. Updated to v4 (free) and that seems to have fixed such annoyances.
Calibration of the monitor itself is quite straightforward. It takes an ambient light measurement and then asks you to place the device on the monitor. You hang it on the monitor using the supplied cord/counterweight combo. It is not going to damage/scratch your monitor with typical use.
(The Elite version lets you pick the Gamma etc while, to my understanding, the cheaper
Datacolor DC S3P100 Spyder 3 Pro version does not. However, unless you are a pro, I don't think that would be a big deal. I feel I may have gotten a bit more than needed and maybe Pro would've been good enough for my use. So, look carefully at the Pro and research more online.)
The calibration process, once started, takes a few minutes. Go, have a cup of coffee. When you return, you will find a message saying calibration complete, remove the Spyder3 and save the calib file. Make sure to include the date in the file name you choose because you want to pick a recent profile, see below.
Once calibrated, you see the massive difference between the uncalibrated (or, in my case, the "eye" calibrated) and the properly calibrated states. The difference is truly emphasized however when you print. The print actually, and finally, looks like it does on your monitor. So, all that laborious tweaking in photoshop or lightroom that you have been doing, finally show up that way on your print. It is of course important to use the right paper and printer profile as well.
When not calibrating, the device sits by the side of my iMac, plugged into a USB port. It is set to periodically take ambient light measurements. When the ambient light and calibration states mismatch, it gives you a subtle warning (thankfully, no pop-ups, atleast on Mac). I usually ignore those warnings until it is time to work on some photographs. Then I check the ambient light state and choose a recent calibration profile for that ambient light. This has to be done manually.
This last part is the only "con" I can think of, and the reason for four stars instead of five. It does not automatically change the device calibration settings based on the ambient light. If it does, I have not been able to find out how to set it up to do so. I am not sure if other devices do this, but this is something else to look into.
Overall, highly recommended device. If you are planning on printing your own photos, any decent hardware calibration device is an absolute MUST.