Wine must kits are huge in Canada, with most folks just doing them at on-site U-brew stores. I believe they are super popular here because they are easy to make, and our high taxes on commercial alcohol makes most wine quite pricey (the cheapest rot gut wines are $7-8/bottle, you are looking at $18-25 as an entry level price point for something decent).
I also feel their popularity has a negative impact on homebrewing. The high profit margins on these kits means most LHBS don't bother stocking decent supplies (usually just pre-hopped beer kits, same as the wine must kits). As a result, a lot of people who do try "homebrewing" just make one of these beer kits, then give up because the quality is poor (most of the beer kits are old and stale). And because the kits they sell are "idiot" proof, this means that most of the people managing/working in these stores know absoutely nothing about brewing in general, even those that have worked there for 15-20 years.
Because these kit wines are so popular, you invariably get bottles of "homemade" wine gifted to you, and most of it isn't very good. I did make a premium wine kit about 4 years ago that included grape skins, I added additional oak, and let it age 2 years before drinking. It is actually pretty decent, and did favourably in some blind taste tests against some commercial wines we enjoy, but at $175/kit, and not being a big wine drinker, I haven't bothered to make another.
What makes me laugh is that if you follow the basic instructions and add all the chemical crap that is included with the kits, they are supposedly "drinkable" within 4-6 weeks... yeah right, but again the target market are people looking for a quick, easy and cheap alternative to low grade commercial wine, so quality really isn't at the forefront for these consumers.