So I've had a 61 plate SDV6 with 8 speed auto since 2014. In that time it's covered 38k to 75k without a single failure of any description and bar tyres, brakes, fuel and servicing has practically cost me nothing in the way of unforeseen bills.
However, it's a lease and it's due back in October, I know it needs front lower bushes replacing as they knock on slow bumps and slow speed sharp braking. From a dealer? £1k a pop, so I'm holding out to giving it back before they need doing...
The satnav / touchscreen / infotainment is woeful, but the audio is very good indeed.
Engine and gearbox are a match made in heaven and I've had mine mapped to 305bhp. It certainly helps and can really shift when it needs to.
Some engine work (turbos, belt changes, etc) are a body off job, but a good local indy will sort that for you without drastic expense.
Take OBC mpg with a massive handful of salt. They aren't calibrated for each given Disco (ie, 18" wheels to 20" wheels are calibrated the same). You can set them up in Mongoose but that's a hassle, best just to ignore it. Don't expect anything above 25mpg, ever. In fact, it's less economical than my M5, to give you some indication.
Versatility is 2nd to none. It's an amazingly capable car, so much so that in a years time I'm contemplating changing the M5 for a year old Disco 5 as that is what my current situation requires and nothing else comes close to the Disco 5.