I have the Omega 8000......I've owned too many to even remember, a good detector is like a pair of shoes, everyone has their favorite brand, and will be quick to argue how one is better than the other.
IMO, the Omega 8k totally out performs the tesoro cortes (which I swung for 4 years prior to owning this one). The additional cost of the 11" DD coil (imo) is a must have item along with the stock coil.
Over the past 10-15 years, my mothers house (circa 1890) has been hunted to death by many of our family as most of us own metal detectors, my first trip with my new Omega 8k produced a wheatie, .22 caliber casing, a key, and 2-3 pieces of scrap, all metal mode, zero discrimination. IMO, it's a great grab and go, all around detector, the TID is spot-on every time, if it says 76, you can bet it's a zinc penny, 84...always a dime, 88 quarter, 82 copper penny, etc, etc. I set my discrimination at 24/25, notch out iron, then dig based upon the TID read outs, unless I'm in the woods then go for all metal mode with disc around 10/12.
The one thing I've noticed (many test done) clad nickles and gold rings (heavy and thin) always TID at 57/58 and everyone's favorite...the pulltab consistently rings in at 54/55 depending on style. I love the light weight and balance coupled with the 1 9v battery operation makes it even better imo.
Aside from all the colorful ads and hype, I think I've found a keeper with the Omega. I also bought another Tesoro Cortes (used) as a back up unit, but I'll always grab the Omega for major hunts. Just my .02. Check out the Youtube vids about the Teknetics Omega 8000, they're pretty impressive.