There's absolutely nothing wrong with refurbished electronics. In fact, most refurbished electronics go through more strenuous Q&A testing than brand new electronics. It's a great was to save some money on a perfectly fine product. They're generally items that are defective right out of the box, returned, fixed, tested at length, and resold.
What you want to stay away from is "reconditioned" products. Those are generally products that were used for a length of time and then sold back or traded in through some sort of buy-back or upgrade program. Those items have usually been used extensively already.
All that being said, I still wouldn't bother with refurbished unless you're saving at least 20% off the retail price, but you can get some great deals on refurbs. I snagged a Samsung Galaxy Note 10.1 refurb for $150 when they were selling new for $399. Works great, looked brand spanking new when I got it. I've bought refurb TVs and stereo equipment in the past as well and have had nothing but great experiences with them all. Companies REALLY don't want to take a 2nd return on an item so they make sure the thing is tip-top before it's resold as refurbished