Six stars -esp in the context of the USA residential window industry today Let me state at the outset some of my comments will be unguarded, but I want to be taken seriously and not for an amateur, paid shill or bot with readers facing the awesome challenge of finding windows that will last 50 plus years and not break the bank. It’s manifest that most established American widow makers have gotten greedy and lazy, focus on marketing and expensive dealer networks, an in many cases , cheapened the quality of heir product. I know, I’ve been there. As a small builder in process of building a house for my daughter, I scoured the universe for well over a year trying to max out her window budget. Once you eliminate Euro windows as too bulky and frames too wide, and real fulfillment questions from overseas (and on time ? And what if a window broken in transit ? That’s a 3 month delay even with the best customer service; I’ve know several boutique Italian manufacturers will send a replacement air freight at 3x the cost of the indoor itself , but if you have to ask how what those windows cost in the first place, you cant afford them) Also the superiority of fiberglass as a frame material becomes quickly apparent. , and Enerlux corner design in particular. Durability, strength, thin lines, top euro quality hardware, etc. Whether you are going for a modern or traditional look, if your budget allows for anything beyond an Anderson 100 series, you HAVE to look at Enerlux as an option. Look, SChuco, Loewen, Western , Raynor , even Marvins high end, make great windows and offer solid customer service ….. if your are paying $100k plus for an architect, or have more money than brains, , hey go for it….you cant go wrong with them . A number of my clients have ; BUT at a steep price differential, and NOBODY has a better quality frame or , customer service than Enerlux. (And for course they are all using-or should use-Cardinal glazing units .While a smaller firm, there is NO way they wont be around for the lifetime of your windows. And in this case, buy AMERICAN -makes GREAT sense from a fulfillment and follow thru service standpoint. Their product, attention to detail and customer service make it impossible for this company not to grow and endure. Customer service is UNPARALLELED- just pick up the phone and try it-you get a real attentive knowledgeable person. You must pay considerably more to get a remotely comparable Marvin ( let alone Weathershield or Pella (dont even start !! LOL ) custom color fee set ups are a fraction of the bigger players. Unless you are seeking passive house standards, are willing to try some of the newer-but unproven - hi-tech glazing options being offered by some manufacturers in the western states, OK with Euro UPVC, not USA vinyl (nothing wrong with them if UV exposure reasonable and youre ok with the look, and size limitations ) can wait out long lead times, countenance dealing with a middle man importer (will they be around ten years from now?) Buying quality windows is a jungle and /or expensive these days- do yourself a favor - go to their web site, dive deeply into it , and get your first quote from Zach Birkel and his team. And if you are in the Mid ATlantic area, happy to show you ours.