I've been vaping off and on since 2009. Sometimes I'd vape and sometimes I'd smoke cigarettes. About three months ago, I bought two things and haven't had a real cigarette since. The first is a eGo Twist (almost identical to the Spinner you're considering), and the second is the Mini Vivi Nova. The two together offer a fantastic vaping experience.
The Mini Vivi Nova looks great on an eGo style battery, produces tons of vapor (I vape mostly 50/50 pg/vg), has a full, clean flavor, is easy as hell to clean and maintain, and I've yet to have one leak -- and I currently have 12 of them constantly filled with juice as I like to change juices often. Some people claim the Nova's mute flavors. In my experience, they do mute flavor vs. dripping on an atty, but not terribly so. I'd say there's maybe, maybe, a 10% reduction in flavor with the Nova's as opposed to dripping, but the way they perform and their convenience more than makes up for it. I've got heads in my Nova's that are over a month old and still going like champs. A lot of people rebuild Nova heads, but I haven't done so. I'm happy with the way the stock heads perform, and at around four bucks, I'd rather just buy heads as opposed to rebuilding. I've tried Stardust clearo's as well but didn't like them nearly as much as the Nova's. I've tried all three Nova heads. For me, the 1.8ohm head at 3.6v is my sweet spot.
My Twists are 650mah. I generally start the day with two fully charged batteries. I vape one when I'm getting ready in the morning and during my 20 minute commute to work. I take three breaks at work, one 20 minute and two 10 minute breaks, and I vape pretty heavily during those. I use the same battery on my way home and usually for an hour or so once I'm home. At that point, the battery isn't dead but I usually throw it on the charger and grab a second battery. I use the second battery for the rest of the night. That one never dies either, but I charge it while I sleep anyway so it's full in the morning. I have no idea how much actual vape time I get from the 650's but I do know that two are enough to last me all day. I also don't know how much juice I vape in a day since I sometimes literally vape 12 different juices from 12 different Nova's which makes it kind of hard to measure. If I had to guess, I'd say around 3ml.
For juice, I'd highly recommend either Heather's Heavenly Vapes or Ahlusion, especially Ahlusion. Most people who try these two never look back. Take a peek at the HHV and Ahlusion threads on here and you'll see what I mean.
A Twist or Spinner with a Mini Vivi and some HHV or Ahlusion juice, and you just can't go wrong. I'm sure others would disagree but I personally think that's about as good as it gets. Hope this helps you.