I have the LD20 and it has been a reliable EDC for me for a couple years until recently. Never had any problems, very rugged, takes very little space in my pockets. A very good light.
The reason I switched my EDC is that the UI of the LD20 (including the LD10) is a little dated for me. It has a reverse-clicky, no momentary on, and it does not have mode-memory. If you would like the newer UI (side mode button), consider the LD12 / LD22 which will be released by Fenix in the near future. I have the PD32 which has the side mode button, forward clicky, momentary on, mode memory, and strobe/SOS hidden, and I've preferred this UI over the older one. Each person is different, but just keep those points in mind.