I normally never keep things around as backup. After using the faster machine, what is the chance one will want to go back to the old one even for a few days. Normally I sell any tech stuff as soon as I have a replacement. MBP have excellent resale value.Still have my 2009 MBP as a backup machine for my late-2013 rMBP. Thought I was going to have to sell or recycle it, but it got some new life with a new battery and the umpteenth SATA cable (had a LOT of those replaced over the years).
I've still been using the super drive to transfer digital movies that still come on a disc. It also has a 500gb hard drive which can store a lot more media than the 256gb SSD in my rMBP. It's nice to have for that. It wasn't going to sell in the condition it was in when I bought my rMBP (wouldn't boot because of failed SATA cable, battery warning, generally sluggish and tempermental). Then I invested some money in it and felt it was better to keep it than sell it. They don't sell for very much were I am (asked for $200 as was and got no bites), and I don't sell on eBay.I normally never keep things around as backup. After using the faster machine, what is the chance one will want to go back to the old one even for a few days. Normally I sell any tech stuff as soon as I have a replacement. MBP have excellent resale value.
The rMBP (2012 model) is the first laptop that has everything I need and I don't see anything coming down the pike that will cause me to spend money I don't have on a computer that I don't needSo I guess typically I keep it until the next refresh.
I feel the same way. My RMBP does everything I need and I see no reason to upgrade for upgrades sake.I usually keep mine in excess of 2 maybe 3 years though with the 2012 rMBP I see no reason to upgrade this in the near future. Spending what now amounts to almost 2k is getting harder to justify especially when the change in performance is getting smaller between each iteration.
The retina screen was a biggie but I'll be happy to get 5+ years out of the old girl. I'm already 2 years into it and its going strong.