CBMyers....
Before you buy the 17c over the G17, I recommend you shoot both. You'll maybe suprised that there will not be much difference. Some other points to mention (Some have already) concerning compensation guns.
1. Cleaning issue of ports and slide.
2. Firing hot loads at night, the flames shooting up will cause night vision issues. Important if you are shooting in low light/self defense in the home
3. If you do ever get into competition shooting, like IDPA.... Compensated barrels are not allowed.
4. 9mm has no real kick that would justify the need of a 17C
5. 17C will be a bit more cash..... and for the value, you maybe better to get the 17 and buy boxes of ammo, holster, 3.5 connector for the trigger, extended slide release, etc.... with the savings.
Yes, I have a 17.... I see no reason for the 17c... Just my 17 cents....
My 17 has the 3.5 connector, extended slide release, well plug and Day/Night true glow sights. It has the trigger feel of a 34 but the smaller size for concealability.....