Time Capsule Advice

Hi, I'm wanting to buy a 2TB Time Capsule to use as a wireless hard drive, but I've been put off by reports and reviews stating that Time Capsules have lasted short periods, with 18 month life-spans being mentioned quite often.

Has anyone owned or had experience with a Time Capsule? I'm just reluctant to part with the £360+ if it's only going to last a year or so. Does anyone also have any recommended alternatives to using a Time Capsule?

Thanks for any help.

Regards,
Simon