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I'm just here to throw my experience and results with anyone in a similar situation.
I have a late 2011 MacBook pro, it was starting the become useless in my expectations with a 2 minute boot up, and xcode loading as well as the simulator taking more than a decade to become useful.
So I got into the mind-frame of selling my £1,850 MacBook for about £300 and buying a new MacBook to keep up. However, first I decided I would try upgrading it myself.
I bought a samsung 850 evo @ 512GB to replace the primary hard-disk, as well as a ram upgrade to 16GB from 4GB.
Products bought
RAM
https://www.overclockers.co.uk/showproduct.php?prodid=MY-342-CS
SSD
https://www.overclockers.co.uk/showproduct.php?prodid=HD-192-SA
This has completely revamped my MacBook and rendered the need for a new one pointless. Unless I was keen to get the retina display, I'm not too fussed.
Boot time is now ~ 12 seconds and application loading and usability is beyond my requirement/expectation.
If anyone is in a similar boat, I recommend doing what I've done until you're required to upgrade your MacBook. However, this 4 year old relic is now performing ( if I dare say ) better than an out of the box 2015 model.

















