I cannot comment on the return policies but I'm perhaps a tad too familiar with the Keysight warranty service.
Specifically, I have a Keysight DSOX3000T series scope.
I have used the warranty service 2 times within a year and tomorrow I'm dispatching it again for a third time. The service in terms of logistics and support from the Keysight crew has been very good. I'm in EU and from dispatch to receiving it back has taken 'bout a week and a few days which I think is exemplary given that the service center is nearly 1000miles away. So far, I haven't had to pay for the logistics either. All the questions about practicalities have been answered within a few hours or a day at most. So I can say that Keysight stands by their product and

for that.
The only nagging point is that somehow I manage to receive a broken scope from warranty, now for the second time. The initial issue and the second issue were intermittent, so I can imagine how these could be missed prior to shipping. But the last issue when the scope literally gives P-Clock failure out of the box and doesn't even display a trace... go figure?!? After dispatching it again tomorrow, I will defenetly go buy a lottery ticket and see if that luck-trace is perhaps an inverted pair of a balanced system

Oh, and the next time I'm buying something that expensive from any brand company, I will buy the extended warranty period for sure. I cannot imagine paying for the logistics and repairs for myself. That would be a financial ELE.
Hope this helps.
I'd like to hear if someone has experience with Tek. I'm thinking about RSA306B or RSA607 and would expect the same level of service if I'm shelling out that cash.
Thanks!
Karl