Unlike a tumble dryer, condensing dryers will never get clothes completely dry, but I suppose it's better than nothing if you don't have the space for an outside vent. Just don't expect it to do what you're accustomed to.
Our first house had a 'washer-dryer' but I never used the 'dryer' function (condensing type). We opted for no dryer when we moved to this house, and after 3 years, I rarely miss one. I hang stuff out as much as possible, and on a rack in the spare bedroom when the weather is bad. We're retired OAPs, so that's fine for us. Way back when we were first married and DH was working in a dirty, grimy environment, I had a tumble dryer.
The only real downside for me is clothes are not as soft, despite use of fabric softener. The upside is less shrinkage, less fading and elastic has a longer life.