Sandfury, I can throw a little more info into the mix and hope it will not info-overload you.
I have never had any Vaprlife devices. There are a few people in the ElixirTV room who have them and they generally seem happy. I have read some varying reviews but that can happen on any device. I think they use some less common and possibly smaller batts. I'd suggest you look into that.
When it comes to variable voltage, especially if you want to use the lower voltage ranges with LR attys, the batteries' capacity to output the correct amps for the volts and atty combo becomes important. Without getting too technical, according to Ohms Law, every combination of atty ohms and battery/device voltage setting demands a certain level of amps to accurately drive that combination. If the batteries do not have sufficient amps capacity, the volts suffer from voltage drop-off (lost volts) until the amps available can satisfy the Ohms Law demands (its a mathematical equation thing). So far, I have only found AW IMR batteries can satisfy
all ranges of atty/volts combinations. If you are using standard resistance (attys 2+ ohms), this often becomes less of an issue. But, the general consensus seems to be that AW IMR batteries give the best range (for tube style batts). I am not sure if there is an AW IMR in the size to fit the vaprlife devices but you may want to look into this. I would suggest AW IMRs for most devices other than unregulated 6V devices - for these I only use AW LifePO4 rcr123a 3 volt batteries (and a charger with a specific 3-volt charge setting).
As for other possible VV devices, while I have not used the Buzz, I have read good things about it and trust Hellen's opinion. As with all devices, each has pro(s) and con(s). The Buzz is light weight and many post positively. The only down side I know of is that the electronics inside are not (or used to be not - don't know if they changed this) sealed. So, while it is unlikely you will ever get juice inside - if it should happen, probably not the best scenario but also probably not dangerous either.
Another similar device is the VV Saber Touch. This operates very similar to Buzz but is a bit bigger, noticeably heavier and probably a bit more money (around $150). Saber's electronics are completely sealed. But, as I said, it is considerably bulkier and heavier. This device uses a touch sensor to activate it. Some people like this very much and others do not. The VV Saber has a 90 day warranty while the 5V regulated Saber and unregulated 3.7/6V Sabers both come with 5 year warranty (all only apply to original owners).
I am pretty sure that both Buzz and Saber require you to use some sort of meter to accurately set the voltage and a small screwdriver to adjust. Some people say "just set/adjust to taste". If you are fine with that - many people use this technique. Saber comes with a connector with alligator clips wires to easily connect to a meter to see your volts setting. Some vendors sell a little digital meter that threads directly onto the device and when you push the device button, the little meter shows the voltage - very quick and easy. Madvapes also sells something similar but a bit better. Their little meter ($13) allows you to connect an atty on top of the digital readout so you can see the actual voltage under-load (device volts with atty attached "under-load" can be different from device alone). It is currently out of stock but you can see it here:
http://www.madvapes.com/Assembled-Voltage-Indicator_p_2894.html
After all of that, you might consider saving up just a bit more and going for PrioVari. At a price of about $160, this device offers many advantages. It uses only one 3.7 volt battery. Stock is AW IMR 18500 (aka 18490) with 1100 mah. You can buy an extension cap so that you can use the AW IMR 18650 1800 mah larger battery. The device uses boost technology so you can vape 3.3 to 6.0 volts with longer lived battery life and not have to stack batteries. The device also has a variety of safety features. It also has all the meters built into the device. It has only one button so you have to press it a bunch of times to access the menus but you can see the remaining batter life, atty ohms, and your volt settings and change volts settings without having to connect any meters (or use little screwdrivers) at all. I think Vapopotamus, at our meet, has one so you can ask him about it. I had one and posted my first impressions in the reviews section. I now use Darwin, which is more expensive, because I prefer it - for other reasons. ProVari IS a great device tho.
I know this is a lot of info. I would be happy to help you more - if you want it. I hope this does not give you a headache!
PM me if I can help you further.
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