If you have the bread and want to be a self-starter, do the 8 day course. No question the guides are pros. It's their life, their living and their livelihood. They better be good.
If you go that route, you need to be totally stoked to climb, fit and ready to go. You need to be prepared to learn a lot on your own and practice a lot on your own. Any course, whether the Mountaineers or a guide service is just a start. The rest is up to you. If you want to get good you have to climb a lot right after the course or you've wasted your time and money.