I love my iSticks and I use the Nauty mini and the flavor is really good so I say load it up! I don't have a REO anymore but I did! You will be fine with the iStick till you get the REO back!
I have a Reo in the hospital for repairs also. I just got two iSticks yesterday. I put my Nauti mini on one and I haven't put it down. This is an awesome combo. Break out the NT!!
I'm very fond of my iSticks - they're really good!
I did notice that with some liquids in particular, they seemed to either taste different or stronger if I used them at the same wattage as I use on my MVP2's.
I turned them down a bit and they're fine.
I then saw this on the UK forum:
I
just found this apparently (confirmed by the manufacturer) that the eleaf istick doesn't down regulate power.
Eleaf Istick
"For example, if you are using a 1.8 oHm coil the iStick will fully regulated your vape between 10 and 16 watts. However, if you want to vape your 1.8 oHm coil at 7 watts you can not do so until the battery output falls below 3.6 volts. In practice, this would mean you would start vaping at 10 watts with a freshly charged battery with the temperature of the vape going lower until the battery was actually outputting below 3.6 volts. The iStick would then regulate your vape at 7 watts until the battery needed to be recharged. The screen will reflect 7 watts/3.5 volts irrespective what volts are actually being output to the coil."
I've never even tried to understand the power details for such things, and just go by what tastes right for me as long as I use the right type of coils for the batteries.