Not sure why you would need opinions of other devices when you have a New tech 3li.
Opinions are just, from people with Mod (X) and not the 3li. Often their Opinions will be skewed by
Their Standards
Their Assumptions
Their abilities
Their view of Value
Etc.
TC has 2 purposes -
Prevent DRY Hits(when possible)
Maintain maximum set temperature without exceeding or dropping off.
Any good TC device should meet those 2 goals
Options should currently include:
Wire choice
Resistance range x to x for builders
I have an SX Mini M and an IPV-D2
Both do as I described
One is upgrade-able and one is not
Both perform almost identical
Both are single 18650
D2 is smaller
SX is better looking
Both are built like a Rock(buy even rocks can be broken)
Both work for me but Again YMMV