2 years of great experience.
used D720 for a year now, and original D710 for 2 year, D720 is really best for night dive, you can find more stuff and hard to reach area for day dive. D710 is powerful and reliable. SD03 is bright enough to be back up light, last pretty long, small, compact, multiple mode. Please give me an unlock red-blue blinking mode please, for acuba police purpose. lol.