Regrets, we've had a few - and they're not too few to mention.
The more tech you have in your life, the more tech regrets you're likely to have.
Whether it is the platform you jumped on just as everyone else jumped off, the phone battery that died at the worst possible moment, the moment of madness when you bought a Zune or a BlackBerry Playbook.
So which tech decisions are you likely to regret today?
These are our suggestions - let us know your own regrets in the comments.
1. Booting up a long-neglected console
Whenever we fancy a quick run-and-gun, our plans are foiled by enormous and essential updates we have to install before we can fire a single shot.
2. Expecting anything but tears from wireless printing
Wireless printers have three operating states: off, demanding ink, and hiding from your router.
3. Buying the Bad Windows
See if you can spot the pattern. Windows XP was good. Windows Vista wasn't. Windows 7 was good. Windows 8 appears to have destroyed the consumer PC industry. We're sure you can see where this is going.
4. Scrimping on storage
Manufacturers' prices for flash storage are often insane, but opting for the smallest capacity is almost always a mistake. The OS immediately grabs a bunch of gigabytes, and a half-dozen cat GIFs will quickly fill the rest.
5. Throwing out your DVDs because it's all on Netflix
We like Netflix as much as the next person, but we wouldn't rely on it for our movie library. Netflix reshuffles its content as streaming deals expire, so what's here today might not be there tomorrow.
6. Embracing the cloud when you have slow broadband
Cloud storage and streaming is great, if your connection is up to the job. If it isn't, you'd be quicker copying your media in Biro.
7. Forgetting the backup bit
Everybody knows that you should always back up your stuff before installing a major software update - but they know it in the same way that they know you should eat healthily, drink moderately and drive within the speed limit. For most of us, the "remember to backup!" bit of our brain only kicks in halfway through reformatting a hard disk.
8. Picking an 'hilarious' email address
Sure, firstname.lastname@example.org might seem like a good idea now. It won't seem so good when you're typing it into job application forms or emailing your kids' head teacher.
9. Taking photos at a gig
Even assuming you aren't using an iPad - something we'll continue to protest against, even though we know in our hearts that it's pointless - the odds of getting a decent smartphone shot at a gig are approximately zero, or less than that if you're using the flash.
10. Leaving the house with less than 63% battery life
63% might seem like a lot when you're at home, but that's because you have Wi-Fi and distractions. Step outside the front door and you're good for roughly six minutes.
11. Expecting a new Apple app to work the same
We're very glad Apple doesn't make white goods, as version 2 of an Apple washing machine would be a cooker, or a helicopter. As Final Cut Pro X and iWork customers learned the hard way, sometimes Apple updates keep the name and stick it on a completely different program.
12. Buying a Wii U
The U appears to stand for "unpopular". Developer support is dwindling and Mario's moustache is drooping.
13. Investing in a 3DTV
3DTV's time in the sun is already over: now it's all about 4K and UltraHD. It'll be back in glasses-free guise eventually, but for now it's the elephant in the room that you need stupid specs to see.
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Writer, broadcaster, musician and kitchen gadget obsessive Carrie Marshall (Twitter) has been writing about tech since 1998, contributing sage advice and odd opinions to all kinds of magazines and websites as well as writing more than a dozen books. Her memoir, Carrie Kills A Man, is on sale now. She is the singer in Glaswegian rock band HAVR.