I’ve not had direct experience with the f29 but read lots of good things and its on my list of bikes I’d like to try as all mine are still 26″.
I do have experience with the lefty’s though and I’m sure there will be a few people who will advise against the lefty but I’m going to say go for it. I currently have 3 bikes all fitted with lefty’s and have owned probably a dozen all the way from the first ones, through the bad(ish) years of the ELO and now the modern ones. They are all fantastic.
Most of mine have gone for 2 – 3 YEARS between services with no problems, and even then I’ve only had them done because i thought maybe I should. I currently have one that has gone 7 years without a service and still rides fine. Its on my winter bike too, so you can say it doesn’t get abused.
Most I do is a bit of grease under the boot and an occasional bearing reset (5min job)
Go for it!