In reply to WonkoTheSane (Forum Supporter) :
Wonko:
https://grassrootsmotorsports.com/new-cars/2019-volvo-v60-t6-awd-momentum/
Most of the commentary here would apply to the S90 as well. I've sat in them in the showroom but never driven one. FWIW the S90 moved to the new (current) platform in 2017, rather than 2019 as the 60-series did, so it has had a little more time away from any first-year bugs.
I would hold out for a T6 version. The T5 moves DW's 2017 S60 just fine, but again, the 90-series is bigger and a bit heavier. The extra torque of the twin-charged T6 would probably be beneficial... but it's your sister, so I won't make that judgment for you.
I would also recommend the Advanced package, which includes a lot of nice stuff like adaptive cruise, which works very well. It also adds a heads-up display, which I love.
The safety systems are pretty present, but they can be easily adjusted to be less intrusive. I don't use the lane departure system, though it works fine. The collision avoidance system is pretty quiet during straight driving, but it gets a little startled if it detects objects just off-path while you are steering. For a real world scenario: say you're driving along on a multi-lane street, and the car in front of you slows to make a right turn. As they make their turn, you ease left to go around them, and the Volvo detects a stopped car in the left turn lane a little ahead. You know there is plenty of room and that this is just a temporary wiggle in your course, but the system thinks you're steering towards a collision, so it throws up the warnings and maybe taps the brakes.
The sensitivity of this system is adjusted by the preferred following distance you set in the adaptive cruise, so you have some control over it. You can also turn it off.
The big iPad dash works pretty well and is not hard to use, even when driving. Entertainment controls are physical knobs and steering wheel buttons, so you don't need to fuss around with it all the time. It might have been nice to have physical HVAC controls but the system is intuitive and big enough on screen that adjustments are not hard while driving. Backup camera and 360 above-view are large and clear.
The dash is all digital, which is nice, but it doesn't include many gauges. Speed, tach, gear, fuel, and alerts are pretty much it. Temperature, oil pressure, etc aren't even available in optional themes - this is a shortcoming, though a common one in modern cars. There is a space between speedo and tach that can be used to display information like current media, nav map / instructions, etc. This is the source of my largest ergonomic quibble:
Under normal driving, I don't want anything there. I've told the car I don't want anything there. But for some reason it insists on sometimes popping up the current radio station and/or song, even though I have specifically said I don't want that information on the dash, just the stack. It's like the radio is so excited to share the news that it just can't contain itself, but then it remembers my setting, and takes it away again. I'm hoping someday a software update will fix that, and I complained about it when I had the car in for service, but they couldn't stop it.
I love driving it. It's quick enough, and power delivery is generally smooth. As a couple reviewers mentioned, the trans is a little slow to downshift if you nail it. Under normal driving that's not an issue, but if you drive the way GRMers do, it's another minor quibble. Honestly, I wish it shifted more like my wife's 2017. Since it is the same 8-speed, I'm not really sure why it doesn't. Again, at least for my car, there was no software update available (yet) to adjust this.
For what it is, general handling is excellent, even when driven aggressively on back roads. Steering feel is a slight step back from DW's 2017, for some reason, but that's not to say it is bad at all. Damping and spring rates are good, firm enough to be entertaining but not harsh. Turn-in and placement are on point for a moderately heavy moderately luxurious car.
Seats are typical Volvo - excellent. I don't know about the base trim, but DW's S60 Inscription and my V60 R-design both have fantastic, supportive comfort.
Both are cars you could drive all day at 80 mph with no drama, no fatigue, and no complaints.