I currently have a mid-spec 15" 2010 MBP and it’s still going strong, albeit with an SSD where the DVD drive was, upgraded RAM and a new battery. They are certainly beautifully-made and long-lasting machines.
However, despite loving Apple design and OSX as a platform, my next machine is 100% going to be non-Apple. The current range of MBPs are hideously overpriced (particularly here in the UK and to a slightly lesser extent the EU) for underpowered, non-upgradeable machines… you could build a high-spec Hackintosh for the studio, buy a second-hand Octatrack for playing live, get a decent quality laptop for emails & Netflix, go on a romantic weekend getaway, and STILL have cash left over from buying the current mid-level 15" Macbook Pro.
If you’re absolutely set on getting a Mac, then buy the absolute highest-spec machine you can possibly afford and view it as investment to spread over 10 years, with a premium for Apple’s user experience, otherwise it doesn’t even begin to add up.
Unless of course you’re absolutely loaded and can drop three grand on a laptop without worrying about it, in which case go for it.