I’ve got an 18month old insignia estate, the ecoflex 160ps variant. Done 43k miles with no issues.
It’s fast, smooth, quiet, great MPG (got 380 miles from a half tank today on a motorway run). I find it a pretty good place to spend long hours on the road. We took it to france fully loaded with a roof box earlier this year and got 700 miles from a tank of fuel at a pretty steady 82mph on the motorway.
However, the boot is not as big as you’d think, the tailgate is huge and does cut down on the space available. It’s a great car but if you need a large boot then I’d go for something else. It does swallow a couple of bikes with wheels on without any problems.
I’m about to order a replacement for the insignia and am looking at estate versions of VW Passat, Merc 220, Audi A6 or BMW 5 series. Currently the blue motion Passat is winning on the list of choices, it’s as much car as I need and pretty low tax.