Depends on what works best for you. It definitely doesn't detract from human touch, but it is a nice substitute, always ready and willing when you are.

Personally I've always preferred the inexpensive bullets. They are unbeatable for clitoral stimulation. If you prefer a penetrative take on it, then I recommend, oh shoot, I can't remember the good brand name, but anyway most call them the rabbit. It's basically a dildo with the middle section as beads (hint: go for the one with metal balls on the track, not the one with pearls that float free-form) it has a small vibrating rabbit on top. You can control the speed of the rotation inside as well as the vibration outside.

Outstanding! Have fun on your search. Don't be afraid to ask them at the stores to put batteries in things before you buy them. Make sure they have enough power to get the job done. Tip: test vibrators on the tip of your nose, it's sensitive enough to tell you if it's worthwhile or not. If you go for something insertable that moves, turn up the power on it and squeeze it in your hand to be sure when you get home that you aren't able to bear down hard enough to stop it. Have fun in discovering.