I have used the fl8 which is a great unit for the price.
The 20 is a great unit and the 22 has great features.
I like the flat screen, zoom features and the tri beam.
I have never used a marcum so i can't comment.
We will be having a Tuesday night Chat with Vexilar Pro Staff Matt Johnson. I will be posting details this week.
He will be able to help us on all the different features on all the vexilars.