I like in this thread how many posters offered different good qualities of the Delta 13.
I own one, and must say it is excellent. Prior to that I owned the Brunswick "Big Break" wooden rack, which is a fine wooden rack. I've also had lots of experience with the heavy duty Diamond wooden rack. When we evaluate a triangle rack like this, it is important to remember that the rack doesn't give a perfect rack, or a consistent rack, the racker does. However, it may be significantly easier for the racker to do this if the rack itself fits the balls properly. Without question, the Delta 13 rack does this better than any other. Thus with new quality balls, you can hold them against the front corner of the rack and *totally* freeze every ball to its neighbors. This won't help, however, if some of the balls are undersized, as is common in cheaper ball sets and with any balls that are old and used a lot. My experience says that Brunswick Centennials and Super Aramith Pro balls tend to hold up the best by far. Also, even if you can 100% freeze the balls in the rack, this will not overcome imperfections in the cloth and under the cloth (chalk dust, etc.)
So here is the summary of benefits of the Delta 13 rack over most other wooden racks:
1) Exactly the correct size. The balls will fit together perfectly in this rack.
2) Aluminum is far more resistant to humidity and temperature, and as such will not change its shape or size.
3) Aluminum is much more durable than wood, and will not splinter over time. Remember that every time you shove a wooden rack into a bar box, the opening to the rack holder is rarely perfectly smooth, and you are just shaving and chunking the rack. It *will* get beat up and leave splinters on the cloth eventually. Even on a quality 9' table, this will happen eventually, it just takes longer.
4) You can test sets of balls to see if any are undersized. Because the rack is so accurate, it will quickly reveal if any balls are the wrong size.
5) Aluminum as a material can be machined far more accurately and to tighter tolerances than wood, hence the perfect size.
6) In MOST cases, assuming the rest or your equipment is quality (balls and cloth mainly), you DO get a significantly tighter rack.
I was lucky enough to get my Delta 13 Elite for free as a gift, but I would have happily spent the money on one. It is a superior product, and I hope we as pool enthusiasts are willing to support our industry, especially when a company clearly is trying to make a new product the best. (And I am FAR FAR from wealthy). It is definitely the best rack out there right now, and it is damn hard to think of how it might be improved (I suppose some might feel it is a bit noisy...)
Hope this helps,
KMRUNOUT