Yes, I've been using Sanyo Eneloops, Sony CycleEnergy, and Tenergy low self-discarge (LSD) rechargeables for a couple of years. I couldn't be happier. I generally get 3 hunts out of a charge, though I don't run them down to one bar - I tend to change batteries once they've been on 2 bars for a couple of hours, because I agree with others that the AT's audio becomes a little less crisp at the low charge levels. I have 3 sets of 4, so I always have a charged set in my pack.
I use a Sony charger that was recommended by an engineer on Amazon as a good low-cost charger that has 4 discrete circuits, so you can charge any number or combo of AA & AAA's. It charges my batteries to 1.4 volts. (Model BCG-34HLD). There are also expensive chargers that can do advanced battery conditioning (discharge, charge, analyze), though I haven't noticed any dropoff in performance thus far - quite the opposite, I think they hold a charge a little longer than when brand new.
At 1500 charges, they should last for many years. I think that the new Garrett ATX comes with Eneloops, so that says something. I've since bought more for everything in the house. I feel good about never putting another battery into the landfill and it suits my personality to buy something that may take a year or two to recoup the investment, but eliminates any cost (beyond the 4 cent recharge) for the foreseeable future.
Others will say that they prefer alkalines for performance reasons - maybe their ears are sharper than mine, but I can't tell any difference except that I change batteries a little more often. On the other hand, I never have to worry about batteries, buy batteries, etc. It's one less thing to worry about when I head out the door, and I like being 'green'. I bought a 4-pack of Tenergy 9 volts that I use in my ProPointers & love 'em too. I've bought Eneloop AA's exclusively for my last several purchases because they're rated 1500 recharges vs. 1000 on the Tenergy's (Chinese knockoffs), and there are other makers now that I haven't tested. Some are re-branded Eneloops (Sanyo invented them). I also have not tested the higher rated (2700mah vs 2100mah) Eneloop or other brands. I decided that for me, getting 500 more recharges was a good trade-off for changing batteries a little more often.
So, that's my story & I'm sticking to it, heh! I haven't shopped for batteries recently, so there may be some new options on the market, too.