Had Outlast liners in my last 2 suits and really like them, I found they worked well over a bigger temp range than anything else I have used, I could get away with a thin base layer and not be too cool at below10c and not be too hot until beyond 20c....
...Assuming relatively still dry conditions, anything can be hot at under 20c if its really humid, and really cold at 15c if it is pissing down.
The point is I needed to layer up / down less, in Spring / Autumn they are great as I can just use a thin base layer and be OK first thing in the morning, all through the day as it warms up and then OK again in the evening, and when touring and going up / down passes with huge temp swings.
If really cold I just put a EDZ micro fleece on, and if really hot I take the liners out.
Don't think it is as good as the marketing hype (what is) but do think they are better than traditional meterials and would look for kit with Outlast in when shopping again.