One of my all time favorite vegetables and a soup I haven't had since I worked for Mrs Rosenberg's B&B as a high school senior. I've been afraid of trying to make it too. First for all the same reasons and second because I'm afraid mine wouldn't hold a candle to Mrs Rosenberg's.
I'm going to try using your recipe, LapLap, and I'll let you know what I think.
BTW, one of the most interesting beetroot dishes I have been served was at a small restaurant in north Devon. They shredded and sauteed them. There's enough sugar in the beetroot to caramelize. It was amazing. I can't remember if it was offered as a side or an appetizer. It wasn't on the menu, but my co-worker remembered it from last visit, asked and it was still available.