My issue is, I'm a fireman, and an avid hunter so I need whatever I use to be able to stand up to the abuse that occurs in my line of work and lifestyle...granted, I know none will hold up to water and drops to the floor very well. I just want one that wont leak in my pocket or break from being in my pocket. That's kinda why I've stuck to the cig type for so long. I can stick it in my pocket, not know it's there and grab a puff now and then when I want to. I realize the ego twist set up is quite a bit larger, and the novas are somewhat fragile so I may end up keeping a cig type available for when I'm on the go, and hunting and such. I guess since I haven't received my kit yet, I'll have to just experiment when I get it.
I think once you get your Twists you will definitely prefer them to any cig-alike battery. It's the length of the 1,000 mAh Twists, 120mm (4.75"), that makes them iffy for being pocketable. The length makes it much easier for any pressure exerted on the ends to break off where the juice delivery device connects.
These models function like Twists but are shorter and a bit fatter. These shorter Twist class models are lower mAh so you may need two of them but they should be be much more pocket-friendly.
650mAh]E2 Apollo Twist VV Battery 650mah
Size:Length 72mm (2.83") - Diameter 20.6mm (.811") at it's widest point
Vision eGo Spinner 400mAh Variable Volt Battery, Black
Length: 78mm (3.07") - Diameter: 14mm (.55")
The Mini Viva Nova is actually longer than the standard size.
Vivi Nova 2.5 - (not including threaded connecter or drip tip)
Length 1.69" - Diameter .75"
Mini Vivi Nova 2.5 - (not including threaded connecter or drip tip)
Length 1.81" - Diameter .63"
If you are going to use Vivi Novas you should get these flared cone thread covers. The flare at the top supports the Vivi Novas making them less vulnerable to snapping off in your pocket. This one works with the standard size Vivi Nova
EGO Stainless Steel 5ml DCT Tank Cone and this one is for the Mini Vivi Nova,
EGO Stainless Steel 3.5ml DCT Tank Cone.
The Kanger M3 is 2 1/4" long including the drip tip. That works out to be about 1/2" shorter than using the Vivi Nova with an average length drip tip. It looks like it has been beaten to death with an ugly stick but you can use one of these
thread covers that makes the M3 very stable on the Twist.