It's a tad bigger than the smok GX350 in every direction, but the shape, for me, is still comfortable to hold and fire. I'm 6'3", 215#, and I can get away with carrying it in a jacket pocket. I think the board is marginally better than the smok board... hard to believe, but true...
Thinking too hard here, but if I were to break it down...
Size/shape
1. smok
2. Ijoy
3. Wismec
Board
1. Wismec
2. Ijoy
3. Smok
Fit/finish
1. Wismec
2. Smok
3. Ijoy
The one big con with the Ijoy is the battery door... ugh...
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Im having an issue with the battery door as well. Mine seems to have warped a little. Not sure if the posts inside are too stiff and pushing the batteries too hard against it or if the batteries themselves are a bit too long. Im using LG HG2s currently.