My family purchased two R15A from vinhnguyen54 who posted in his sub-forum on this website that he is selling a batch of them after modifying them:
"
My only simple mod is make the head turn tighter, smoother, more water resistant."
The threading (tightening/loosening) is smooth, and I like the distance of tightening required before activating the high mode; with the Ti2, the distance from low to high is very short -- it's so short that when the Ti2 is off, if I am in a hurry I sometimes accidentally overshoot the low that I want and wind up in high mode. I like the fact that it is not possible to over-tighten the flashlight -- as soon as you activate the high mode, additional tightening is not possible at all. In contrast, it is possible to continue to tighten the Fenix LD15 and the Thrunite Ti2 after activating high mode.
The beam pattern is wonderful -- I think it is nearly identical to the beam pattern of the Ti2:
The brightness and diameter of the spills seem identical. The hotspot of the R15A is a little bit brighter than the hotspot of the Ti2; but the hotspot of the R15A seems slightly smaller.
The R15A's low mode is a little bit brighter than the low mode of the Ti2, and I think it is more practical because it is useful in more situations to me than the lower low mode of the Ti2.
In both of these there is
no off-tint like green or blue or purple; it is
only cool white which is exactly what I wanted; one unit is a cool "cool white" while the other unit is a neutral-ish "cool white". I'm hoping/expecting that the R15A has the same great regulation of the R02A which you can view in a comparison graph about half-way down the page in this link
(link) or this link
(link). The R02A has better regulation than the Ti2 whose regulation you can see in a graph in post
(#45) at this
(link)