Gino,
It would be easy for me to say yes. Then again there is a no. So, let me break it down further.
If you shoot 1911's a lot, the slightest difference in a crisp trigger, over-all fit and finish, etc will be a world of a difference. What you pay for is not only the name but the fitting of the high beavertail, 30 LPI checkering, match quality barrel, TIGHT slide to frame fit, over-all accuracy and so on.
Les Baers are well known for being the tightest 1911's. There's absolutely no play at all. Once you own a high-end 1911, you never go back to production guns. It's not an ego thing at all. You just end up shooting better and the feel is so much nicer.
As for the no, if you don't shoot a lot. You won't notice the little differences. However, you will notice the differences with the over-all quality. No machining marks, better fitting, tighter slide/frame, better trigger, better barrel, checkering, etc.
So
Questions:
1. Yes
2. Yes
3. Yes
I hope I answered your question.
P.S.
I can fire my Concept III 1000 rounds straight without cleaning and it won't jam.