TM is a great buy. The gun shoots amazingly far, accurate and hard. The few that I've used were amazing. I think you should upgrade to a full metal kit. If you run propane in a stock TM 1911, it will wear the slide away over time.
Only real con i have with the 1911 is the low gas capacity in the mags and (this is just TM in general) you have to remove the slide to adjust the hop-up.
Other than that, they are great guns.