The size and weight are perfect for even a T-shirt pocket. Exactly what I've been trying to achieve with my 18350 mods for close to a year now.
Restricted DTL with the afc ring completely removed. Near spot on match for my Lemo with afc wide open.
Very difficult to see the full line in any lighting. I plug in the charge cord in so the red light illuminates the tank. Easy to see that way. First device I've had that I can fill directly from my 60ml bottles with big fat filler tips!
Pretty much equal to a full tank. I refilled at least 4 times yesterday. It will take more than 1 iCare to get thru the day. I've got 2 with 2 more on the way. Shirt pocket convenience with a decent (IMO) DTL vape is worth it to me.
I've already cluttered too many threads answering queries on them.

Here's the iCare thread.
All Things about the Eleaf iCare & iCare Mini