After the initial phone screening, three interviews were arranged. Each lasted about an hour. The recruitment and interviewing staff were polite. The questions and material were on-point.
Although I needed to go out of my way to accommodate the interviewers' schedules, the experience at this point was indeed positive and all signs pointed to a favourable response.
After being told explicitly that an answer would be forthcoming within a matter of a few days, getting a definite answer took three weeks of patiently following up at weekly intervals. This is a lot of time when you are looking at other options and expected to provide an answer to other potential employers.
I was then told that feedback on my interview performance and the reasons for passing on my application would be provided, again within a few days.
Having followed up once a week for three weeks after that, I realised that the hiring team was never going to provide said feedback. Furthermore, if the company is not prepared to dignify the time that a candidate will put in to preparing for a reasonably intensive interview cycle with the most basic of follow-up requests, showing such scant respect for prospective employees does not suggest a constructive or respectful company culture.
I think it's fair to say that I dodged a bullet.