Long time Vanguard customer. Agree with previous posts, both in low cost and lack of hand holding (or calling you to sell you something). One nice thing about the cheaper Admiral shares is that when you reach the minimum amount to qualify, then Vanguard automatically switches your shares to Admiral - no issues with you having to remember to make the change or even knowing that you qualify (unlike a lot of banks, etc. who will introduce higher interest rates for a savings account, but never tell you about it).
Vanguard is generally not for day traders, they generally discourage you by not letting you reinvest for a period of time, if you buy and then sell quickly. They say (I believe rightly so) that in and out traders increase their operating costs and decrease their stability, forcing Vanguard to sell and rebuy more frequently, which increases their costs.
BTW, their offices and employee compensation reflect their low cost model.