That is interesting since my experience has been just the opposite.
I'm not familiar with the Toltec II, but a good hunting buddy had a Toltec 100 that I thought was one of the best until I bought a Whites Eagle Spectrum. In 1991 I bought the Eagle Spectrum because my hunting buddies had new top of the line machines. A Garrett Master Hunter and the Toltec 100. We took them to our local park, as we always did to test a new detector, and the Eagle cleaned house. Coin after coin was found that neither the Master Hunter or Toltec would even make a sound on.
In 2001 I decided it was time to upgrade again, hoping to pull a few more goodies out of the park that my Eagle had pretty much cleaned down to 10", so I bought a XLT. I tried everything possible but the XLT just didn't seem to have the performance my old Eagle had. It was a great detector, but it could not pull anything out my Eagle had missed. After 2 years I sold the XLT and bought a new DFX. Right off the bat I was back to pulling old coins from that park again. Not so much deeper coins, but coins that had been missed from being masked by junk and the likes.
I learned a valuable lesson about embracing technology some years ago about computers. I was your typical devout DOS man. I had tried Windows 2.5 and was not impressed. A good friend, also a computer guy, was always trying to get me to go to Windows claiming it was better. I used some valid reasoning to stand by my guns saying that Windows was just a lot of overhead that slowed the computer down. I would say I could do anything in DOS, and faster, than he could in Windows. This was true until processor technology caught up. I believe the same is true with detectors. For a short time manufactures were adding tons of features that only seemed to slow the detector down. What use is a detector that can sample the ground 10,000 times if you've got to hold the coil steady for 2 minutes? Detector processors are now starting to catch up to the features. The DFX, for example, has a crap load of features to enhance its ability to adapt to pretty much any hunting condition or situation, yet it still has good fast response.
I now embrace computer technology because it makes my job much easier, as does detector technology.
I think once you get used to a detector, unless you have a huge improvement over your old one, like the Eagle did for me, you tend to feel the new one is a lesser detector. Contrary to what many believe, detector technology is a constantly improving thing. Faster processors, better target ID'ing and separation and better ground condition handling gives the advantage to the newer detectors. Something we just don't see it because we have become so accustom to the old "reliable standby"