read, a lot lol the cr10 will print great but it can take time to get it all dialed in, don't be tempted to start upgrading things before you've got it running nicely.
Lots of people moan a lot about being unable to level the bed, these people are idiots!! its not difficult, yes the glass is warped on most of them but it still isn't rocket science!! any issue you'll have will be covered on the cr10 facebook group, the main weak point on the cr10 is the fans, they are cheap and nasty so replace them as soon as you can, on the hot end (the bit the plastic comes out of) the main fan will break down eventually, on my little printer it took months to fail, on the s5 is broke more or less right away, when it breaks your printer will keep jamming after around 30 mins or so, just replace it with a good quality PC fan, the standard replacement most people use is the Noctua fan - which I also use and had no issues with.
The control box fans are also noisy, but I've not bothered replacing those as the printers are in a different room so I can't hear them anyway.
Take it slowly! get a few small prints under your belt before launching into a hulk buster!