I also use an Airizer from time to time. I purchased the Air model in black. Compared to the solo, it is all cylindrical and it came with two glass mouth pieces. One has a plastic cigar filter type tip and the other is a glass tube. I smashed the glass tube within the first two weeks, it just fell and broke. For the first while, I just crammed bud in and the airflow and draw was only okay. Since then I have made sure to grind and to pack it loosely. The battery life is good for one or two sessions but I charge it after every use. I would give it an 8 out of 10 for portability and heat settings, it loses some points for battery life though.
QB