Received UF-2100 3 mode today from DD (ordered 30/7). The review on 1 mode from manafont is pretty accurate. Outside finish is nice, reflector and glass are clean, led is well centered, threads were dirty and dry on mine, beam not too ringy and came with SS "attack" ring (only attack thing are sharp threads on it) but:
1) Threads are visually OK, but feel a bit rough when screwing. I cleaned and lubed them, but still not as smooth as they should be.
2) O-rings seem to be too small.
2) Modes. Fresh TF flames: High 1,78A, low 0,09A. Strobe is a bit slow (about 3-4Hz).