the other *Big* advantage of the A2 is that it has two different beam profiles in one, the LEDs are nice and floody, the regulated incan is throwy
yes there are other multi-level lights out there, the two most popular choices being the SF L1 and the Novatac EDC series, however, these lights have the same beam pattern on all levels, the L1 leaning more towards throw, the NT leaning more towards a balance between throw and flood
the two different beam profiles of the A2 are just so incredibly useful, there's a reason the A2 hasn't left my side since I purchased it, it's just that good
the Streamlight TwinTasks are vaguely similar to the A2, but the incan just doesn't have the punch of the A2's incan, and the SL TT's are unregulated, so they'll get yellower as the batteries drain