I have both. The Klypse is good, it has a cap which keep the pod clear of pocket lint, but it uses pods that you can't reuse.
The G2 is a much better device, the replaceable coils are better IMO, the 0.8 being the best. Additionally the airflow can be adjusted so you can get it just right for you.
The G2 has fast charge. It takes an hour for the Klypse to charge, and less than 30 minutes (25?) for the G2. That and the adjustable airflow seal it for me.
I dont know what exactly the sizes r, but until i lost it, i loved my vaporesso lux pm40
I have a artery pal 2 quite a small pod mod and was less than a tenner with p@p. was on the bargain page on here
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Thank you I will have to keep an eye on the Vape Deals page