well - 10 days on. A7 is still working like a charm on my REO and SB. I made a new coil for it that i am using (i'll be honest - it took me about 4 goes to get it right!) but it's working great for 4 days nonstop. I am using plain cotton wick, rather than the silica, because it is dirt cheap.
The A7 has become my fav accessory - it is reliable and i have never used the second one. Now - that awful burned taste at the start....this is really for dogsofwar. What i did the first time was just vape thru it - it passes! What i do now is i carbonise the coil before i fit a wick, i don't have a blowtorch - so it spends some time in my zippo flame, glowing red and then it seems a lot better from the start.
the REO has been splendid - it's easy to change the liquid when it runs out and very mess free. The door rattled and so i used a bit of clear tape at the bottom of the door to stop that (thanks Grimm Green) - and in the last few days, i noticed the battery was not firing reliably. It's because my 18650 is squashing the hell out of the spring. i found if i take a tooth pick and move the spring back to a central position after changing the battery - i'm cool.
Next i fancy some stainless steel mesh as wick for the A7 and the Nova tanks i run a lot on my SB and i hope to get some of that in the next few days. Kind Regards
Trunker