I have gone round and round between the Glock 30, 3" 1911s, and 4" 1911s.
Here are my general thoughts.
The Glock 30 is great, reliable, accurate, and has lots of capacity. Also, you can get it really nasty with little concern for finish damage. The only downside is it is very thick. IWB carry is hard to do unless your clothes are big, loose, and sloppy. OWB is comfortable, but printing is more of an issue, again because of thickness. I don't IWB carry the G30, but I do frequently carry one in a belt or pancake holster, when my attire permits. Even with OWB carry you have to wear loose clothing. Trying to cover it with a tucked out polo style shirt prints badly, but its not so bad with a camp or Hawaiian style shirt.
3" and 4" 1911s give you more choices. IWB carry is much easier, because of they are thinner. The 3" models are very easy to conceal.
As for the reliability of the short barrelled 1911s, I would say the 4 and 4.25 inch models are as reliable as 5" models. Maybe the three inch models are not as reliable, but the one I have has never jammed.
It doesnt matter how reliable the 3" models are in general, it only matters how reliable yours is.