Hi! Welcome to the SWDB forums.
I had the Vigilante Collection (I've still got the Gunslinger Collection). The quality's not perfect but it's not bad at all for a cheap starter set. I'd advise you though to ditch your plans for the Vigilante Collection and go for the Spaghetti Western 44 Movie Collection instead. Not a lot more money but a lot more movies (and all of the movies on the Vigilante Collection are on the 44 Movie Collection). On there you'll find some good movies, some great movies, and more than a few crap movies. Film quality is never greater than adequate, often resembling the experience of watching the film on YouTube on a ropey connection, but it all adds to the fun of Spags for me. They're perfectly acceptable startoff points anyway, from whence you can decide if you want to pursue individual DVD/blu-ray copies of Keoma, Mannaja, Grand Duel, Django Kill, Four of the Apocalypse etc.
And if your budget ever stretches to it I thoroughly recommend this, the best box set you can buy: