The bottom line I think to how to go about it is what do you intend to do with the image after scanning it.
Do you want to print it up at some massive size to put on your wall at home, or even sell commercially, or do you just want a copy to put up on facebook or share over the computer with family or friends.
To print and frame it up at eny decent size you'll need a very good copy/scan indeed .... to share it on the internet or your computer, then you don't need to go all out to get the best out of the slide.
Perhaps most can be copied in a cheap and easy way .. but you may have a few gems that would warrant best practice to get a top quality digital copy.
I have copied many of my slides in a few different ways.
I have the old FD mount Canon Auto bellows and slide duplicator.
I have projected slides on a pure white surface at a medium to smallish size to keep them sharp and just taken a digital shot.
I still shoot film on Linhof Technorama 617s 120 panorama and also a Horseman 4x5.
I wanted the absolute best scan I can do at home without having to send them away to be drum scanned.
Lots of research later and I opted to buy an Epson V750 pro ... I had to import it from the USA as Epson does not even sell that model here in Australia, I have a transformer to drop the volts down to 110 from 220.
I then bought a wet scan kit from "Scan Science" in Canada, waited the 4 months for the kit to come out by boat.
The kit comes with shims to adjust the height so you can dial in the correct distance to achieve perfect focus.
It does take some time to test and sort out a work flow, I have it dialed in now.
I scan at it's max optical res at 4800 .. the tiff files from a 120 pano come in at about 2gb
I could enlarge these easy to 100" x 30" on the Fuji Flex paper and they would look brilliant.
Yes they do take time to de-dust, working clean helps.
So bottom line is what is the final use of the image you want, and decide what lengths you are prepared to go to to get optimal image quality.
Those that say they don't get good quality from the Epson don't know how to use it correctly, or not taken the time to do so.
The quality I can achieve from the Epson V750 would hard to differentiate from a scan using a 20K+ drum scanner
End use is what should determine the technique you would use here.