I've used my Vega-11U for printing in colour. It came out superb. I've seen large prints made with it (not by me, lens was borrowed to make prints for a show), and it stood well enough with the other prints enlarged through the more conventional lenses.
I've used my Vega-11U for color printing, too, and I'm satisfied with the results. Woolliscroft, though, doesn't want just satisfactory prints; he used the phrase "best of the best." The Vega-11U, although a very good enlarging lens, doesn't fit into this very elite category, IMHO -- or at least, mine doesn't. As I posted earlier, it's possible that mine is substandard. If so, it's not substandard by much -- it's noticeably worse than my Nikon EL-Nikkor f/2.8, but only when using a loupe to examine the edges of prints. My Vega-11U is superior to my other enlarger lenses (an Industar-96U, a Durst Neotaron, and a Nikon EL-Nikkor f/4 -- all 4-element designs), although with the exception of the f/4 Nikon, a loupe is required to spot the differences.
Don't forget the Vega-11U's long neck. Although it works fine on some Western enlargers, it makes the lens useless on others and restricts the size of enlargements it can make with some. At best, a potential buyer will know from somebody else's posts how it'll work, but more likely it'll be a gamble in this respect.
If a lens bought for $5.00 turns out to be bad, that's not much loss...it could always be drafted to some other use, such as a loupe for examining negatives or contacts- they're too small to be used a paper weights anyway. But if lens turns out good, that would probably be the best five bucks you've spent.
This is true and it's certainly be a point in favor of many Russian enlarger lenses for buyers on a budget. Woolliscroft doesn't seem to be in this category, though.
Note also that used enlarger lenses have absolutely plummeted in price in recent years. Doing a search on recently-completed eBay auctions, I see a Componon 80mm for $26, a Nikon 50mm f/2.8 that didn't sell with a starting price of $28, a collection of six lenses (a couple of which are probably slightly superior to the Vega-11U) for $20, and so on. Lenses described as APO are still rare and more expensive on eBay, though -- I only see one completed auction, for a Rodenstock 50mm that went for $78. All of these are likely to be more expensive than a Vega-11U, but not by all that much (with the exception of an APO lens). For somebody who's looking for "best of the best" performance, an extra $10-$30 is probably not significant, and even an extra $70 might not be.