The one that you linked to from Gearbest is a Convoy L2 clone. For a Convoy L2 clone, I would highly recommend getting the one from banggod here:
The driver looks like the same one from GB, but I’m not sure without handling the GB version. I can say though, with BG’s version, the stock driver is easy to mod and can be used with an MT-G2 (see here , here and here ).
I’ve got the Y3 as well which has been modded with an MT-G2 and the beam profile is floody whereas the D19 is a good mix between flood and throw with an MT-G2. Also note that, the Y3’s stock driver has visible PWM on low and medium, whereas the stock driver from the D19 doesn’t show visible PWM.
Last, but not least, banggood was nice enough to reactive their discount code for the D19 when I bought it. It was simply a matter of PM’ing them and they gave the code to me (ie. $36.99). With a group-buy, you might be able to get the price lower than this, but IMHO, this is already a very good price. One last note, the first two D19s I ordered from BG didn’t come with AR lens. However, the last one I ordered (which I received yesterday), did come with an AR lens, BUT it was MUCH, MUCH more difficult to tear down. I even had to buy a wrench strap to remove the bezel and I had to heat up the driver retainer ring with a soldering iron to get at the driver. Other than that, it seems to dissipate heat really well (5A with either an MT-G2, XM-L2 or XP-G2 and my latest, 7.5A with an MT-G2!) and is a tank of a light.