We won't have hardwoods in the new house we're having built right now, but our last house had site-finished oak hardwoods and I used a steam mop on them every 2 weeks or so, and weekly I used a microfiber mop pad with either Bona cleaner or filtered water with a touch of white vinegar. I used this combination for the 7 years we lived there and it worked fine but the last 2-3 years I really noticed the shine of the floor dulling. We never had a problem with warped floor boards, bubbling, or anything like that but at the same time I can't say it wasn't slowly damaging the wood over time because I just don't know. The dulling may have just been from heavy traffic with 2 adults and 2 small dogs since it was a small house and all of the hardwood areas were main walking areas. Really think about possible long term damage.
I used to own a Bissel steam mop (it was the mint green colored model) and I can say do NOT get that one! It's really terrible...it leaves way too much water on the floor so I'd have to follow it with a dry cloth every time. I've used the Shark steam mops at my in-laws house multiple times and it works much better in terms of putting out steam vs just water. The floors are much drier with the Shark. I believe the Hahn steam mop is highly rated as well.
We'll have laminate flooring in our new house and I really want to use a steam mop on it but won't. When it comes down to it, steam mops do NOT sanitize the floor (in order for it to actually sanitize you'd have to hold it over the surface for at least 20 seconds, if not longer which no one does) and they really aren't any easier to use than a microfiber mop that you either wet & wring out before attaching it or using a spray bottle to spray the floor. Steam mops are pretty good at getting a sticky spot off of the floor better than other mops, though. The laminate floor we'll be installing is "safe for wet mopping", safe to install in bathrooms & kitchens, and "practically waterproof", but it's not waterproof and because it's a floating floor a steam mop just sounds like a bad idea long term.
For a normal microfiber mop, I have an O-Cedar pole and 2 microfiber pads (
Walmart, probably Target, etc). A lot of people rave about the Mopnado mop on
Amazon...I've had it on my wish list for a few years but haven't bought it and I'm not sure if I'd rather keep with my current mopping style or try the Mopnado...the mop head on that looks like it would trap small particles that I missed with the vacuum better than the straight pad which can just push them around sometimes.