My second was unintentionally born at home (I'm sure you already know that, but you asked). :lol:
It was full on at first because I didn't realise it was happening so fast and the pain was unbelievable. But once I realised what was happening it was a very calm and confident birth, in the spa bath (not with the bath filled, just a shower trickling on my back...actually...I'm just now realising dh must have turned it off at some stage before he caught bub :lol:).
The only issue I had (apart from being in shock from the fast birth), was a PPH, I lost about 2L by the time I got to hospital by ambulance, I've retained placenta both times now, and maybe it's different from state to state, but my ambos didn't carry synctocin, my birth support partner (now a midwife) asked the midwives at the hospital and they said ambulances didn't routinely carry it, but it's possible things have changed.
So I guess that's my concern with a freebirth really, it was my birth support partner who noticed the amount of blood I was losing, the paramedics were mostly focussed on bub. So it'd be good to have someone present at home who could identify issues that might need prompt attention. Not to be dramatic - but it's worth acknowledging that if it had just been me and dh, we'd have notched faintness up to a quick dramatic birth, and may have called an ambulance too late for me.
So in summary - I think a birth at home can be a calm, focussed thing, but I think you'd want to have your bases covered logistically, ie, I wouldn't do it if I didn't have access to ambulances and birth support experienced/knowledgable enough to identify and help with any issues.

