I toyed with RapidWeaver three times over a period of more than a year, each time getting nowhere - the first hour experience is truly dreadful, the onboarding guidance zero and it's a blank canvas when you open it up - it's hard to know where to start. That's why I gave up. I tried some themes, they seemed to simply tie me down into someone else's idea of good design and layout. I couldn't get the colour scheme I wanted, stuff wouldn't stay where it was put, the results looked like 1998.
Two things changed for me: Stacks, and Foundation. Stacks so that I could accomplish something other than the basics, Foundation (and Joe's excellent tutorials) which allowed me to get a layout I wanted. But that all came at a cost, of course - and that cost is not made clear to those buying RapidWeaver. Sure, you can make a website with RapidWeaver, but if you want a decent one with decent functionality, you;re going to need Stacks, and stacks... perhaps lots of them. The cost quickly mounts.
I started hand-coding sites in 1995, the moved on to DreamWeaver in a commercial context, but had had around ten years off making sites (not a real part of what I do anymore), and had missed the mobile first thing. I needed a mobile site quickly and without hand-coding because I simply didn't have the time around the day job. In a selection of stacks I found every bit of functionality I needed to replicate my old site. I replicated the old site, made it mobile-friendly and integrated payments, a database and a lot more using stacks. I spent under £1,000, on a site which was quoted by a professional as £7-8k. Money and time well spent.
How long did it take? well, setting aside my three failed attempts to use get something done, I'd say about three months part-time around the day job. One month for research, watching tutorials, finding the right stacks, etc. And two months to build, test and deploy. Definitely worth it. Not possible in a week. RW is a good piece of software, but it's nothing without the add-ons.
I've had mostly great support from any of the developers I've contacted (not many, not often). I've never had to use Realmac support, but they're clearly struggling. That's a shame.
You can't learn it in a week unless you're full-time and fast
It can cost an awful lot more to get a decent site made
That should, perhaps, be made clearer to people
The first hour experience could be improved
But, overall, I'd say that coupled with Stacks, RW is a grand product with the usual set of quirks expected in any piece of software. And this community is most excellent.