feedback on Vermak windows (GEALAN Linear)

Looking at different window packages for a future homebuild and have quotations from EAS (Schuco), Seemly, Zola and Euroline currently. Does anyone have any experience with Vermak USA and the GEALAN Linear uPVC windows with regards to performance and transaction ease?
I am in North Georgia, climate zone 3/4 (Neighborhood is split between two counties, one is 3 and one is 4).
Appreciate any shared experience on good to great windows for this climate.
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I had the opportunity to visit their factory in Minneapolis a few months back and while small, I found them to be professional and competent. While I was there we discussed various certifications, including NFRC (they aren't listed on the NFRC site, but assuming that they are going that route, completing certification can take some time), also they weren't using Cardinal IG units at the time, but they were in the process of getting set up with Cardinal. Sounds like they now have them which is a plus IMO.
We discussed dual pane vs triple pane in a tilt/turn unit, since triple is much more common in that design, and while they offer triple, they also felt that dual was more than adequate in many places (I totally agree) and that offering dual pane tilt/turns to folks in climates that really don't need triple, at a slightly lower price point, was a potential benefit for people in those locations.
Overall I was very impressed by their professionalism and enthusiasm, and if I were building a new place and wanted tilt/turns (disclaimer, I currently have 17 year old tilt/turns), they would definitely be on my short list.
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