S21D w/ Nichia 219b 4500k is one of the first lights I bought when I found BLF. I personally love LEDs with rosy tint and since then have used it as a standard (personal preference) to measure all my other lights.
Besides the many features that are outstanding about S21D, there are a couple things that are important (to me), that I wish it had: side switch and on-board charging. So the other day I ran across this offer below, and next thing I know I have one coming. 
It’s available both on Aliexpress HERE and Convoy store HERE, but the link on Convoy has the MAO finish, which I love.
