You can get the Vamo body for not much more than $25 from fasttech. (Not to mention in an emergency you should be able to get batteries at Radio Shack. Bad brand but any port in a storm.)
I got SS, 2 batteries and a good charger for $50. That's a way better deal than 2 Twists.
The 5 amp switch on the Vamo combined with the variable wattage (RMS) makes all the difference over the eGo Twist.
I don't know if it's the switch but it's definitely better performing. VW is great.
The only thing the Twist has is size and weight. What I really don't like about the Twist is no low battery warning.
I'm almost at my 3ml of average daily use through it (25.5 hours since starting on an 18650) and my Vamo reads 3.9v. It's the first battery so I'm not sure how much that means is left but after this I will.
Once I get a second Vamo I imagine I won't be buying very many eGo batteries because I have 4 new ones and my last ones are still going after a year. But I will still use them because I can only fit 1 Vamo and 1 eGo in my divided ecig pocket and I like to have flavor variety at all times. But I didn't mind the Vamo size while tilling the garden just now.