Not bad, though not perfect either. Occasionally when I go to open it, all I get is a dark grey, unresponsive screen. Simply turning it off and on again (with two quick clicks of the power button) fixes this though, so it's not a big issue. The auto-correct on the keyboard is really funky though, and unless my fingers are fatter than I thought they were, it likes to insert random spaces and (sometimes imaginary) words so that 'random' becomes 'ra an dome' or something, which is not an issue I had with my previous refurbished SE (2nd ed). I've changed the auto-correct, auto-punctuation and predict features to off in settings, which makes things a bit better but I still occasionally have the issue. The screen went completely unresponsive on me at one point when I opened the phone onto safari, and I had to do the 'volume up then down quickly and hold the power button until you see the apple symbol' restart, after which it was working normally again. Other than those (mostly just mildly inconvenient) issues, it has been behaving fine. Oh, it also didn't let me do the connect-to-mac info crossover when I was first setting up the phone, but from what I could see online this is normally clunky and was probably not just an issue with the phone? I guess this is what you have to expect with refurbished phones and they aren't tremendously frustrating problems anyway, but it is perhaps a little bit disappointing they couldn't be picked up on in the refurbishing process, or if they were known, that they weren't communicated to me prior to or upon arrival or even as possibilities of purchase on the website. However I must say that, while I have received a better quality phone from another refurbisher for a similar/slightly cheaper price, the customer service at backmarket was excellent and opportunities to leave reviews like this and get in contact with them are very much appreciated. Overall, content with my purchase.