Anyone used the M&S plug-in fragrance diffusers?

[Lastyearsmodel]

Putting the house on the market and want low maintenance nice subtle fresh smell wafting about the place.

Doing the windows open, lots of cleaning, essential oils on cotton wool behind radiator, of course, but want a bit extra and don't like the Glade/Airwick smells.

What are the M&S plug-in diffusers like? (pic on link says refill but think is labelled wrong?)

Do they smell natural?

I got some cheap ones from Aldi (vanilli I think), surprisingly long-lasting and unobtrusive and only £1.99 for the whole thing, not just the refill.

M&S Christmas ones were disappointingly crap - so bad I took them back & got a refund.
Even on full blast they did nothing. Tried Glade but they aren't that much better though about half the price.
Anyone recommend any alternatives that actually work (haven't got a local Aldi)?

Thanks for the replies - very useful.