I have the Mini version and I really like it. The Mini has all the same features as the regular size device and performs exactly the same except for the battery life. My kit came with two 18350 ICR 900mah batteries and I also bought an AW 18350 LIMN 700mah so I would have another backup if needed. I have been using various cartos at 1.7, 2.0, 2.5 and 3.0 ohm. lately I have been using 3.0 ohm Boge cartos in a Mini-Sub 3ml tank running the device at 5.2 volts and it works really well. Running it at that voltage setting I get about 4 to 5 hours or so heavy
vaping before the battery reaches 3.5 volts and then I replace the battery with a fresh one.
The time a battery is going to last you depends on what voltage you vape at and your own particular vaping habits but for me I find the batteries last an acceptable amount of time. The standard size LT uses 18650 batteries which are going to last a while longer.
I chose the Mini because I wanted something a little smaller to carry in my shirt pocket while I am at work or on the go. It works well for me and I carry two extra charged batteries with me so battery life is not an issue. Both sizes are a great choice just depending on individual preferences.
Hope that helps.