We have seen loads of variable points of view.
Some say it's a pretty good engine, smooth, for long distances and low consumption.
Others report problems, but none of them it's engine faillure or major issues with internals... so, with good maintenance, obviously with the correct usage like every engine, i think and that's my opinion, it's a very reliable engine for more than 300k without problems... of course, clutch, turbo, and all peripherals are allways wear components and not critical to replace (normal in all brands and engines)