So...I've got this small guest bathroom...
It currently has a 20 year old sheet linoleum floor; it's tightly bonded to the concrete slab underneath, but is really starting to look ugly.
Do you think I would have success laying down a engineered wood floor on top of it, either a click-lock or floating type? I'm thinking that the old lino might double as a vapor barrier and resilient underlayment.
I suppose best practice would say to remove the old lino and put down a regular vapor barrier and underlayment, but getting the old lino up is a chore. The room is only 5'x8' and, minus the tub space and vanity, the floor area is smaller yet; still...getting old linoleum up can be a real chore.
It's a small area, and I think the flooring cost would be negligible.
Think it's worth a shot? 
= new reply since forum marked as read
Thanks. 
It generally comes in 3 1/2"-5" planks that can either be glued, nailed, or floated. Bruce, Armstrong, Shaw, etc., make the stuff. I'm looking at either gluing down to the vinyl underneath, or just floating on top. I'm leaning toward floating; if I end up needing to replace boards it will certainly be easier if it isn't glued down.
I know wood floors aren't the best for bathrooms if you get a lot of water. Our girls are grown and out of the house, so the shower in there is rarely used anymore, as opposed to when they were still at home (seems like someone was always in there in those days). 
I think the plywood core will do better than the laminate products, and the wear layer of hardwood can be refinished at least once (possibly up to 3 times, depending on the product).
I figure the total floor area at about 30 sq. ft., including the area taken up by the vanity, which should account for waste (although there shouldn't be much).
The more I think about it, the more I'm leaning toward just laying it down over the tight vinyl (it is vinyl, not a true linoleum).
Thanks for the response.
I was a painter for 30+ years. I've smelled my share of stink.
And the Armstrong linoleum you linked to looks very interesting.
I suppose I'm just drawn to a certain look I hope to get with engineered hardwood (hopefully not warping, etc.). Plus, I have all the necessary tools, and I feel more confidant doing the install than I would with linoleum.
Hmm...you've given me something to think on here. I suppose I'll ask my wife what she would prefer, and if we want to pay for professional installation of linoleum.
Thanks for the response.
Decided to go with 18"x18" porcelain tile set in Thinset on a diagonal layout. More work, but a better surface for that bathroom than engineered flooring would have been:
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Grouted with PolyBlend "Delorean Gray," and with toilet re-set. I ran a heavy bead of "White" GE Silicon caulking around that tub (after I took this photo) :
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I installed some 31/2" wood base to replace the old vinyl cove. The wall color I originally chose was SW Kitchen and Bath Paint tinted to "Natural Choice," but when I got it on the wall it dried with a faint yellow-ish/gold-ish cast. So, I added a couple of drops of blue from my tint rack, and got a color I was quite pleased with. It reads a bit "greener" in the photo than it appears on the walls. Base was painted with SW ProMar 200 in un-tinted "Extra White" eggshell finish:
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A really beat up, faded, 25 year old tract-grade cabinet. I sanded it down and did a hard wash with lacquer thinner and a rag, which took out most of the stain color (looked like it was originally ZAR "Golden Oak"
. That left it a very light brown-ish color, and very smooth to the touch.
I then restained it with ZAR "Moorish Teak" and then applied some coats of tinted lacquer (Mohawk's "Medium Mahogany" followed by "Dark Mahogany," and then some shading with "Dark Walnut).
My wife is happy...so it's all good.
On to the laundry room, as I work my way from the back to the front of the house.