I bought a BM869 a couple weeks ago, and I like the meter very much. However, the Crest mode is unreliable. On the V setting, measuring a 4.1 v battery in Crest mode for example, I can get voltage readings as high as 4.7v, or -4.7 when switching the probes around. Usually, the bad reading is the one not currently showing, e.g., MIN when the measurement is made with MAX showing, and vice-versa. Thus, I avoid Crest mode and use REC mode instead. I cannot reproduce these erroneous readings consistently. Repeating the measurement several times in a row usually does the trick though. If you connect the meter to the circuit BEFORE pressing Crest, then it is useable for catching fast transients and less likely to be spooked by noise.
I would much rather have a Fluke-style Hold function that works normally. I don't care about catching fast ms pulses. I use a scope for that sort of thing.