I own two Olight T-20's, and at the time I bought them I thought they were very well made and still do, however I believe there are much better lights available now. Why limit yourself to 123A's? You could get something that runs on either 123A's or a 18650, nice to have that versatility. I find the tailcap switch difficult to use with one hand, very hard. How about something with an infinity brightness? Personally, The Ultrafire WF-502b and the UniqueFire L2, I purchased from DX are amazing and half the price. Good luck.