Yes, all the time and no issues and fast shipping. Will typically order from them if can't find something local or not available at orange big box. Previously used to purchase tubs, toilets, sink bowls, faucets, cabinet hardware, lights, etc. I believe they are an offshoot of Ferguson LLC (multinational plumbing and heating distributor).
I have used them often and wouldn’t hesitate at all.
Recently, I ordered 3 complete Toto toilets and they were delivered to the house on a truck with lift gate at no extra charge.
While the box stores typically stock the low cost, inexpensive models of everything, Build seems to have a better selection of the better brands and more complete product lines. This applies to everything from ceiling fans, to bathroom towel bars.
I've used them for several bathroom remodels. They have a good selection, and you can chat with real people that can help with pricing on large enough orders or resolve issues if they do arise.