I've had 3-4 good experiences and 1 bad experience. The bad was someone trying to hustle me down; i.e., agreeing to a price, then trying to change it later. I really enjoyed selling it to someone else. Otherwise it's been good.
Generally speaking people are very cautious about being ripped off (as they should be). As a seller, you need to put them at ease by doing things like posting lots of piks, being very detailed in your description, and accurate in the item's condition. When it sells, take it down otherwise you'll keep getting calls.
I was actually quite surprised how quickly some items sold. I was expecting it to take weeks but I had calls within hours in some cases. When I sold my unopened Xbox One before Xmas I practically had a bidding war. Which brings me to another point...
Timing is everything. I sold potential gift items before Xmas without any problems. I sold an old exercise bike in January when everyone starts looking to work out again. Put some thought into it and you'll maximize your payout.
Personally, I make them come to me (put "pickup only" in the item description) so I don't end up wasting traveling to a no-show. It also helps weed out the people who aren't serious. And it shows you're not desperate to sell; if they can't come to you, too bad so sad.
Finally, make sure you have the price nailed down before meeting. Otherwise be prepared to get haggled down. I always set my price beforehand and if they show up and try to haggle I pack up and start to walk away; I've never had anyone refuse to pay the agreed upon price when they saw I was ready to walk (again, that's why you make them come to you).
Overall, I would recommend Kijiji and I plan to use it again in future when I have stuff to sell.