First of all, the idea that it is work could go either way. It CAN be a LOT of work. But if you have a screen and a polaris vacuum and a chlorine feeder, there isn't really that much to do. I spend maybe 15 minutes a week doing "maintenance" on ours. Unless I get lazy and forget to check the skimmer or chemical balances or refill the chlorinator (once a week or so, depending on how high we set the dial on it)... Then, if it starts to "turn" it can take LOTS of time to get it straightened out.
Essentially, I have the kids get a water sample every time they hop in the pool, I clean the drowned frogs or lizards that sneak into the pool area out of the catch bag on the vacuum when I notice something in it, I add chlorine tabs to the feeder once a week or so, and shock it once every week or every other week (again, depends upon usage). If it is just our family swimming every day it is no big deal. If we have a lot of guests or a party or something, the balance on the chemicals needs more attention.
Cost? Maybe it is different because we are in the south and had ours installed during construction of our home, but including the screen, polaris etc, it cost us less than $20k. The screen was a big chunk of that. But it is SOOO worth it. Because it also filters a bit of the suns rays, it keeps the pool from getting too hot most of the summer (a problem sometimes down here late in the summer), it means we don't need to use sunblock at all, and it keeps the debris out of the pool, which cuts down on cleaning AND chemical use, because decaying matter changes the chemical balance of the pool.
I have friends with a salt water filter, and I have discussed it with our pool place. They are personal preference as to whether they are "better". I have heard my friends complain about the salt residue on their windows where the polaris tail sprays sometimes. And every time something goes wrong, it is $500 to repair, because it is regulated by a computer chip. So, to me, it is similar to the new washing machines. The new technology can be great, but it can break more easily and is more costly to repair if it does. Mechanical features are more reliable.
I will say this. We built our house/pool when our kids were just turning 5 and 8. They are now 11 and 14. We have EASILY gotten our money's worth out of it if we never used it another day. And I said the same thing two years ago... And we are STILL enjoying it.
Husband loves to hop in after mowing the lawn or going for a 5 mile run, to cool off. And so do I.
It almost always makes the kids get over any squabbling they might have going on, too. :)
ETA: oh... and the amount of chemicals we use costs an average of $200 a YEAR. We don't "open" or "close" our pool at all, because we rarely get freezing temperatures, but we only actually swim in it from late April through late September. Even the pump and polaris don't add that much to the electric bill.