I am very pleased, my cranks were stuck after not being maintained by the previous owners on a regular basis. Now that I am saving over a hundred for a new crankset all I need is a bottom bracket. Now I am alittle torn between what BB to get. Shimano has the UN5x, UN7x, and UN9x. What would be the best? I read that as long as you go between one of those 3 you will be good to go, but would it be worth it to get the UN91 as its about as good as it gets and its only 30-40 bucks?