Likewise interested in how you get on with the HPG Windcheater.
I have a number of their packs. While their Windcheater looks good in Colorado and Utah I am curious how it would work somewhere with a damper climate. I like my Paramo windproof, and it is light, at 300g, but lacks pockets or ventelation. The Helikon Trooper has pockets and ventilation, but is 643g and not as shower resistant due to use of stretch fabric. HPG Windcheater looks to have pockets, and ventilation, but quoted weight is 680g, which might be a lot if a separate rain shell is needed.
Chris