I'm looking for a puffy....light and packable. Not planning on using in in super cold seasons....either here in Fl or more or less summer in the mountains. I have lots of jackets and fleecies now but they are all heavy and don't pack down small.....

Any opinions here Mt Hardware's Thermostatic?
It looks pretty cheap with the labor day sales now, and might serve me well enough
SO leaning towards it

comments on performance, durability, and sizing?
I'm 5-10 and approx 170#-180#,average build not slim.... but it seems like Medium might be about right based on the few reviews I've found....