My first handgun was a SIG P220 and I've owned a total of three 220s. You will find it to be an excellent handgun.
It is also very large, so you'll need to get good gear to be able to conceal it well. It is not "impractical" for concealed carry; it is very possible. You can hide it under just a t-shirt if you know what you are doing--it just requires a bit of skill. Get an inside the waistband holster with LOTS of forward cant. Since it is also a heavy gun, belt loops that are widely spaced will assist in keeping the gun stable on your belt. Look at a Milt Sparks VM-2 or similar (http://www.miltsparks.com).
A DeSantis Scabbard would be good too (but doesn't have as much forward cant).
I found that the double action trigger is difficult to master, especially for a new shooter. You may want to consider the DAK trigger because it is consistent in feel for all shots (around 7 or 8 pounds, which is manageable). The ultimate is the SIG P220 SAO (single action only, with a weight around 5 pounds) and I highly recommend it once they get the bugs ironed out with the safety.
Do carry at least two spare magazines on your person. The 8+1 capacity is good, but you may need a reload or two.