So I also contacted concept aquariums out of Canada and their price was extremely competitive, probably the best one I have gotten, customer service seemed awesome and only had a 5 week build time.
Anyone had any experience with them? They sounded fairly new
Yup, that is who I had build my tank. I had a 210 built. Peninsula style, starfire/low iron glass front pane and one side panel, and euro brace. 54" W x 30" T x 30" D. Friendly, prompt, and a bit over 5 week build time. Price was right. Got a good conversion rate. Also ordered stand - steel 2" tube - powder coated black. Shipping wasn't bad but had to pay extra since I didn't have delivered to a dock, drop to house was more. Anyway tank was shipped perfectly, packed perfectly, crate was sturdy, no damage. In fact I reused the wood from the shipping crate several times over

Matt is who I dealt with. Called, Q & A, agree, they send a diagram, I signed off, payed 1/2 for deposit, they start build, few calls to clarify questions, sent a few images, finish, pay remaining, pay shipping, received. More or less that was it. Sat in my garage for almost a year before I got around to unpack due to other priorities.
Few things didn't turn out like I ordered but nothing major. Main complaint was that I wanted a smooth overflow weir on the back panel but also a slot design that was the width of the pane of the glass or overflow. What happened is that they did the weir but then added slotted acrylic. I didn't want the vertical slots - just the weir

Anyway not a big deal and I can actually fix it but that was one reason why I went custom. Only other thing is that the eruo brace is clearly made out of scrap glass. It doesn't have a smooth finish / cut like the main tank. If I went without a canopy this would be a major issue. However, I have a canopy so it is covered. Other than that the class is scratch free, seams are solid, and it is well built. I am very pleased and would order again. I would just clarify my two concerns so it is corrected.
In another forum I saw a really nice looking tank. They said it was from concept and give them a call so I did. So far, so good. I know there are two other companies that people use and they are probably double the price if not more. I can't say which is better but I'd wager from what I've seen they have a better finish. Does that make it worth it - that is up to you. I'm pretty happy but honestly time will tell. If I was being honest it doesn't matter who makes the tank in the end. 200 gallons of water is always going to be a concern regardless of who made the tank. That is how I saw it so went with concepts. It won't hurt to call regardless.