While I personally have never built one of their kits, I've seen dozens of them fly, and they do fly very well. They are still indeed in business, and are going to be putting on a demo at Plaster Blaster this next month in which they launch one of their models (different builds, but the same design) on motors ranging from D on up through H. How many other rockets do you know of that are designed to handle everything from D's through H's???
Bear in mind that they are still a small business, so they might not have the instant response time that people have come to expect from places like Amazon and McMaster-Carr. But all in all, they're good folks to work with.
WW