I recently tried some of the IDEAL RG59 compression fittings from Lowe's and I had nothing but problems with them. I never felt like the wire was going far enough into the fitting and I ended up without conductivity. If there is a visual reference in the fitting, I could not see it.
The ICM fittings get good reviews and I wonder if it was just me... I went back to some solder/crimp fittings and everything went smooth for the rest of the instal. I certainly see the advantage of not having three pieces, but my first experience with the compression fittings was horrible. I have done a lot of BNC on RG59, 58, 316, 178 and never had any problems.