IMO, all three are nice playing cues. I've had the least exposure to Whislers, but have hit a few of his plainer cues...nice, crisp hit.
We've had a lot of Cokers. Over the last 3-4 years, they have gotten away from producing more "custom" stuff and most of the cues coming out of their shop seem to be "production" style cues IMO. Their tolerances are not nearly as good as the used to be c. 1998-2000 (uneven ring work, uneven point work, glue lines showing where the point veneers come together and meet the forearm, wavy point lines, cut too deep wrap beds, etc.) You don't see these issues on every cue, but you do on many when you didn't before. Cokers still play great...very stiff, though. Still a good cue for the money, especially if you like that stiff hit.
Gilbert has great workmanship in the cues, and for the money you cannot beat them. You simply (IMO) cannot find a comparable brand new cue out there with ivory joint, ivory inlays, veneered points, and nice ring work for around $1000. They hit better that most of the other competition and hold the resale value very well on the secondary market. You can also vary the hit a little because he does several joint configurations (3/8-10 flat, piloted 5/16-14 with steel, ivory, or phenolic (and of varying thicknesses)...great flexibility. Most people feel that Andy's designs have come a long way over the past 3-4 years, too. We design most all of the cues that we buy from him, and Andy is quite flexible on new ideas and open to suggestions and new styles. He is one class act to deal with...one of the finest men in the business !!!
My $0.02 on the matter.....hope this helps.
Sean
www.cueaddicts.com