As long as you ignore the term "tactical" in the product description, the Acebeam TAC AA is a nice EDC flashlight. On the larger side for a AA flashlight, but just the right size for a comfortable grip. The Nichia 519A with its lovely tint and high CRI will make you happy. The universal beam is great for EDC use and comes with good throw for a light of this size. Build quality is superb and it feels very robust.
Unfortunately the driver is on a different level: Simple brightness regulation using PWM and the modes are messed up when using a NiMH battery. A real shame, because the TAC AA would have been a very nice, simple AA flashlight for family and friends. I wonder why Acebeam didn't use a better driver.
Overall the Acebeam TAC AA struggles to stand out against other less expensive flashlights. Yet it is a good option if you need support for Li-ion and NiMH batteries, as long as you don't miss the medium mode with NiMH. There aren't many other candidates with similar features.
I've found Acebeam's AA/14500 drivers disappointing. That's partly because Acebeam has set high standards for what to expect from their drivers, and those are hard to meet in $20-30 budget lights. Unfortunately, regular price on this on is $40.
The dual fuel and 14500 size is what got me to buy this. I don’t really like the input lag on the switch which is unusual for a “tactical” light but it’s a great size and shape for EDC, albeit the clip ramp could have been made smoother. Altogether this is a great light to carry if you need to be able to source batteries “in the field” as AAs are so commonplace.
Maybe I have a different revision than you. Both of my Tac AA and Rider RX have probably 150-250ms of lag after clicking the switch to when the light actually emits light.