We got one a few years ago now to replace an open fireplace.
Much better at heating the room. Because it burns at a higher temp/more efficiently and with secondary burning of smoke, there is much less ash and hardly any embers - everything gets burned properly.
I agree with others about the wood ash for cleaning the glass.
A couple of things I recently found helped. get it lighting initially with plenty of flames to heat the flue and get the drAught going properly to suck the smoke up and out rather than the cold air pushing down and trapping the smoke in the stove (which makes the glass get black) - so start with a firelighter and some very dry sticks that will catch quickly with all the vents open to allow lots of air in. (And yes, hot fires will often burn off any smoke residue on the glass, but not always).
And once it is going properly and there is a draught sucking properly, but also a nice glow of embers going, turn down the air enough to manage the burn - you want your logs to burn well with enough air to prevent smoke but not so much air that the logs burn through too quickly.
But at the end of the night, when it's just a small amount of embers left, (well after the last log was thrown in), don't close the dampers but open them up so the last bit burns well rather than getting much cooler and starting to smoke from not enough air. Or you might go to bed with a nice clean glass but wake up to a blackened one.