I have used a Miami Classic for years with a 1911. It has pluses and minuses. It is overall very comfortable, particularly when I am driving a lot. The pistol on one side with two mags on the other balances very well. I have never bothered with tie-downs.
The problems include, that when you draw, you need to watch your left side. I grab my right shoulder with my left hand so that I won't sweep my arm when I draw. I don't know of any ranges that will let you practice with one because of this. You are stuck going out to the desert. (Which isn't necessarily bad.) I also find, I have to take trouble to keep id concealed. A heavy coat works fine in winter, but in warmer months, if I wear an open shirt or suit jacket over it, I have to watch constantly to make sure that the wind doesn't blow it open.
Just get a good one. This Galco is great, but I but a $25 Uncle Mike's or something like it once, and it was terrible. Nothing fit right, and the adjustments wouldn't stay put.