Well now that I have an actual opinion instead of just speculating, I'm resurrecting this thread from the dead.
I have owned and carried a 5 inch RIA 1911 in both OWB and IWB holsters and didn't have much trouble concealing it.
I just picked up a 3.5 inch RIA. Shorter barrel, and an officer frame.
I now get it. While it is doable to conceal the 5 inch (especially in cooler weather), it is much easier to conceal the compact. I think everyone should have one of each.
Since both of mine are steel, the weight difference between the two was pretty negligible. The 3.5 I bought did come with Hogue grips on it, and I like them so much I had to go ahead and order a set for my full size.
In summary, I now understand completely why people want both.
![Jester :biggrinjester:](./images/smilies/biggrinjester.gif)