A couple of years ago they had a lot of bad press due to dodgy RAM mounts and poor warranty response but I've not heard of anything recently. So while not especially unreliable I think they're overrated and don't warrant the price premium.
they are unreliable at all...we have 2 which perform well. Downside is cost of repairs, but don't know if this is typical of all laptops or just Sony. For example a new laptop screen from Sony will cost c.£600+. Luckily I got the same screen locally and fitted for £200.
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