Sara- My 8 year old daughter has been using the Animas Ping for a year now and I can't imagine life without it! It gives her such freedom in when she eats as well as better overall control. The best advice I can give you is, be patient. It will take a while before you get all her settings adjusted and then when you think you have everything right, it all changes. I wish I had better prepared myself mentally for all the changes that would occur continually. It is all worth it though!
Some other tidbits of advice... Don't be afraid to try different infusion sets to see which one works best for her. We actually use 2 different sets, depending on where her site is located on her body. The pump and screen scratch easily, invest in a skin and screen protector. There are tons of pump pouches out there and at age 5 I would definitely recommend you get a few. We love SPI belts and have a few. The clip on the pump breaks easily and costs $20 to replace. We only use the clip if she is wearing a "dressy" dress and she doesn't want the bump of the SPI belt. We just clip it to her undies/tights. If you have a diabetes bag that you take when you go out, you will need to add an extra infusion set, cartridge and battery. We have had several outtings when a site got pulled out accidently or a battery died.
Good luck with starting pumping! Are you doing a saline trial first? Seems like many endos do start with saline so you get used to all the button pushing before you start with insulin. Hope it all goes well!