You got a GREAT deal on your Tek. I picked mine up on Craigslist for 175 bucks and I got a great deal.
I must say (again) that I absolutely LOVE my Delta 4000.
I too started with BH machines; 3 of them. I can't agree with diesel266 that they "suck" because I have found all kinds of treasures with all of them; including the oldest coin I have found (an 1814 LC), silver coins as well as both gold and silver jewelry. For what they are and their price, they're capable units and excellent training devices due to their ease and simplicity of use. Using them also taught me a great deal about this hobby (and loving this hobby) and enabled me to hone my skills to a point where when I got a better machine, I KNEW HOW to use it well.
My hunting went to a much higher level when I got the Tek. I started hunting spots I pounded hard and found lots of GOOD stuff the BH's missed.
The Delta is amazing IMO. It weighs nothing so you can swing it all day and all night , uses only 1 9v battery that lasts forever (and cuts your operating cost WAY down) and finds amazingly small and deep targets. It has true notch capability that works great. If you get tired of digging Zincoln's, just notch 'em out. It's that simple.
You can't ask for better pinpointing capability either. It's truly idiot proof. You press the button and watch for the lowest number which will be right on top of your target. You can start digging targets with this machine immediately. The learning curve is very small, believe me. It could not be more simple to operate. I also like the volume control and the two headphone jacks; 1/4 & 1/8".
The VDI is pretty darn good and overall target indication is pretty good too. Like any detector, the machine makes a "best guess" based on depth, soil condition and the target itself; as well as the actual position of the target. Sometimes a coin in a vertical position can give a very different signal than one that's lying flat. But as far as coins go, the target indication is very accurate most of the time.
Non coin items may not be as accurate but that's typical in this hobby. Pop tops and pull tabs will always read like nickels and gold with any machine because they have the same type of conductivity and fall in the same range. You just have to dig the trash to find the gold and nickels. That's just how it is and you just have to accept the fact as part of the hobby.
But when you keep digging trash, eventually the gold appears and makes it all worth it.
I went out on my first impromptu hunt of the year on Easter Sunday for about one hour at a soccer field. About 4 minutes into the hunt I found my first ring of the season. It's just a very small, once gold plated monogrammed pinky ring but it's a ring nonetheless and the Tek sniffed it out immediately. It was deep and looks like it was down there for a very long time. As I've said on this site many times, it LOVES tiny targets and hits really deep.
I haven't posted any pics of that ring yet because I've been crazy busy.
As SouthFLdigger said above, as far as dry land goes, you can't go wrong with this machine in this price range. It does fine in fresh water though. The minerals in salt water will throw it off but that happens with many detectors.
Even if you get something even better down the road, you'll have a rock solid, reliable machine that you can always fall back on and be confident about. I definitely highly recommend it. It will not let you down.
If you decide not to keep it, let me know. I would be happy to buy it from you. But honestly, once you use it for a few hours, I have no doubt that you'll wanna' hang onto it.
When I next upgrade I'm definitely sticking with the Tek brand.
Oh, and Papalittle, you definitely have a messed up machine. From your description, there's no way your Delta is working properly. Something is undoubtedly wrong with the particular machine you wound up with. You should send it back and either get it fixed or get a replacement.
If you got it new you should have a 5 year parts and labor warranty. I would use it if I were in your shoes. Good luck.