Six months almost to the day i've had the S60 now, and just back from its first scheduled maintenance.
Supposed to be 12,000 km intervals, but it wanted service at just over 9,200 - so in it went today.
First six months have been flawless. Still really really like the car - the T6 engine is awesome - tons of mid-range, it rockets past pokemons like they are standing still. Feels WAY more powerful than my old TL, the S60 is +40 in HP and about +100 in torque... but it still surprises me how much quicker it feels.
I do like the turbo

Love the interior too, clean & uncluttered and seats are all day comfortable. Chassis feels very solid, not a squeak or rattle anywhere - I sure couldn't say that about the TL.
Mileage has been consistent since day 1 - around 11-12 city and 8-9 highway. The avg. always sits around 10.5 - 10.8 with about 65-70% city driving. Given that there is 300HP /325TQ on tap, I think thats pretty good. Based on a few fillups where I did some mental math, the computer is accurate.
Only one negative/annoyance with the car. The Nav system sucks. It's a PITA to program, have to input address, etc with the rotary dial.. takes forever to program. Also on a couple of occasions I get a message that it can't navigate to an address i've programmed. Both times the addresses were places that have been there for ages. If you can get it to accept an address, the guidance works well (tells you what lane to be in,,,etc)
The mapping detail leaves a lot to be desired too.. it shows only a couple of street names, and the ones it chooses to display are usually dinky side streets, not main roads... weird.
My $150 Garmin works way better. This is my first car with nav, and it will likely be the last.
Other than that minor complaint. i'm still happy with 'er.