the SHARK can do more power, up to 4 Amps, while the Maxflex should be used till 2 A drive current
(means f.e.: 2 Li-Ion cells --> shark = 5-6 leds, MaxFlex = 4 Led)
I had a shark and remora here for quite some time and now finally installed them - and am heavily disappointed: the three levels or not too much of a differnce (for me!), the lowest level is too bright for my sense, the max is just 800 mA to the leds
(triple led with 2 Li-Ion 18650s)
also there is no option to change the levels - a feature I am now used to from my other Flupic-lights. Sure the Shark/Remora never ever proposed to have this, but ...
the remember last setting and ESPECIALLY the switching between levels is as unpredictable and safe, as those drivers from DX and I hate it.
(normally the remember works - something I also hate - but then switching to the levels means turning the driver on and off multiple times, till this function kicks in eventually)
... next multiled will see a taskled driver, just to get a comparison
except from this, the Shark is very rugged and runs totally cool