Well, I am far from an "expert" pool player, nor am I a pool table expert for that matter. However, I've played on a lot of tables, in a lot of venues, over the course of forty years. I do know a thing or three about "construction" in general, from my professional life, friends, experience, etc. That said, my opinion may count for nothing at all. However, I had a GC (III, I think) growing up. We had the table for over 10 years. Not pool room use, but a lot. Only one in the neighborhood, LOL. That, at the time, was the best table on the market. Now, when I started playing a lot, all around the tri-state area, going to famous and shady pool rooms, LOL, and throughout my lifetime, I've got to see a lot of tables and played on a lot as well. I've also seen a lot of tables unassembled, taken apart, etc., and looked at their construction, how they are made, etc.
That said, in general, the early GC's -- those tables were tanks. Ver solid, built extremely well, quality materials and design, from what I could tell and in my amatuer opinion. They were the commonplace -- and the gold standard -- in most pool rooms I went to in the 80's and 90's. I felt they played true. I am not that high-level player where I can pick apart and critique the intricacies or nuances of the table. When Diamond started getting popular, I saw a lot of their tables, and I knew a guy who was opening a pool room in NJ (about 25 plus years ago). He decided to go with Diamond (a few different models, I don't remember which ones). I saw the tables when they arrived, watched them assembled. They looked like good tables, built well, good material, solid -- but they did not seem to be on the same construction level as the comparative GC. I believe all the Diamond models he picked were less expensive. I don't remember what he told the prices were. But I remember back then, when a high-end pool room opened up in Englewood, NJ, and Jersey Mel opened his pool room in South Jersey, and another high-end pool room opened out in Western NJ (I forgot where) they all went with Brunswick.
Now, I've played on a lot of Diamonds over the past twenty, maybe 25 years or so. Don't get me wrong, their top of the line table(s) are good tables. Quality. Play well. I don't know if they measure of to today's GC. I have no idea. This Predator table here, I never played on it, new saw it. But from the pictures, the construction does not seem up to GC level. Thanks.