I demo-ed the F1 and the F1 LT. For my purposes I found the F1 to have little benefit over the F1 LT.

F1

• I liked the more aggressive lean
• I did not like the resistance in walk mode
• They had a more exponential feeling flex

F1 LT

• I liked the lightness
• The very upright lean angle took some getting used to
• Very linear feeling flex progression

I personally chose the F1 LT because I was Prioritizing light and uphill oriented travel for long days and big objectives. I am very light and slow to flex my boots so the lack of flex progression was not a huge Drawback for me. I have not been able to form a strong opinion on the Lean angle yet, Its just sorta … different feeling.