I know even less than you, JennaWren, as I didn't even build a site. DD did mine on what I think may be the same tools you used for your husband's, and kept saying it was "bad" to work with. However, she was twelve at the time.
I have been able (with some super frustrating moments) to manage/update it myself. I should say that if we are talking about the same site builder, (connected to a large domain name registrar,) it has been *much* improved to manage for those of us who are not versed in html of are tech-savvy. The tools are better now than they were even a year ago. But obviously, they are not WP. What you get is something less easily hacked or compromised, at least from what my techie DH tells me.
The cost is negligible unless you use a professional web designer. (I know all the reasons posted on these boards for a more polished look, but personally I have never bought them, nor see the justification. When I look at other less polished author sites, I actually prefer these. It would be different if rather than selling your writer self, you were selling yourself as a designer, web or not.)
I have heard the same about what dresamddamps said, regarding domain names. I don't know it for a fact, but I’ve heard this.
I hope someone who is in the know chimes in. Hopefully, not someone who is selling their services as a designer.