I mostly agree, positioning different elements is pretty easy.
Here's a screenshot of their editor.
I decided to grab a shirt and see how it turned out. It arrived yesterday!
I'm pretty happy with it. I wish the symbol were a deeper green (could this be because it seems to be a white layer underneath because it's a black shirt?), but I'm satisfied with the text. The large is maybe a little snugger then I would normally like, but it might work out, I wonder what the xl is like.
The SVG Images I pulled from smoke.io, not used with this shirt so what you can do with them is probably better.
I hope I'll be able to advertise some for smoke.io by wearing it. Possibly spark some conversations. Wear it to any social work events, etc. If you want smoke stuff there are a couple places online you could take the SVG files and get stuff made. Local shops are likely great options as well.