I love my eGrip aside from a few small niggles.
I wish it had a screen so you could dial in power exactly instead of guess'ta'mating where you are between 8~20w based on where the dial is and knew exact battery level instead of the guess from how the led is blinking.
There is only a 1.5ohm coil for it, though you can get an RBA base and build your own coils. The stock coils don't really wick fast enough to use more than maybe two clicks up from 8w (which is about 12w), but the RBA base can run all the way up to 20w if you wick it right.
Have to use a needle point bottle to fill it, droppers won't work. Well actually you can, but you have to remove the whole coil and fill from the bottom instead of using the filling port. I just use 10ml needle bottles.
There is a little runup from when you fire it until the vapor starts flowing into your mouth. But that is pretty much a side effect of the distance between the coil and the end of the drip tip (like 4"+) and very little you can do about it. Not a big issue though.
Adjusting the airflow requires a little screwdriver and you have to be careful not to cover the intake with your hand. I just do the proper gentleman/lady tea drinking gester (point your pinkie up) and have no problem.
In depth cleaning is a... not nice word. I take the coil out, put the base back on, and fill it with distilled water. Close the door and shake it up really good. Base off, pour out water, and use a couple of qtips to clean as best I can.
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Baring all that, the thing kicks out crazy vapor for its size and power. Like with the stock coils on the lowest (8w) setting nothing but my subohm tanks or RBA/RDA/DDA can touch it. Really dense full of flavor vapor. The airhole, coil, and chimney/drip tip are a straight line that Joye seems to have done some careful sizing and airflow work on, along with optimizing the stock coil for the setup.
Power and juice for days. Well not really depending on how much you vape but it holds 3.8ml (actually closer to 4ml but they say 3.8) and I've gone two or three days without a recharge. Plus if you have a needle tip bottle it is very easy to refill (trust me on this, you want a needle tip bottle).
Surprisingly solid, heavy, and well made. When you just look at it, you wouldn't think it weighs as much as it does. Really solid well made device that feels like you could club someone with it and it wouldn't even scratch it (not recommending you test that though). Since it is all enclosed in a solid block of metal (besides to long slim and recessed windows to view your juice level) it does not have any of the structural weakness you get from a tank on a 510 connection. Won't snap or leak in your pocket.
Shape fits the hand and pocket very well. I have long slender hands and it feels just right. If you have big mitts then it might be a little small for you though. Also slips right into a pocket real easy. I have one of those alluminum wallets and it is smaller.
As I said, overall I love it and it is my go-to device when I am out and about or doing something rough and tumble.