I did shots for 25 years and have pumped for 9-- I'd never willingly go back to shots.
The only reason not to go on a pump is lack of money or insurance because pumping is more expensive than shots.
If you haven't done so, contact OmniPod and Minimed and ask if there are demo sessions in your area. The Omnipod website will send you a free sample (you wear it without insulin). I wasn't a fan of the Pod because it was too bulky and adhesive bothered my skin. But we're all different and I know others who like them. I happily use a Minimed 522 and though I've had a few pump malfunctions Minimed has always sent a replacement within about a day. Because it was a short amount of time I just took multiple shots of short acting insulin until new pump arrived. Frankly, I'd have no idea what my long acting dose would be. With a pump you use less insulin than with shots.
I always carry a syringe and extra bottle of insulin with me, in case of pump malfunction and also to supplement if my pump is running low and I'm not able to change the infusion set (I work full-time and go to school part-time, so am often away from home 12-14 hr. days). Instead of carrying a new bottle of insulin I typically take a bottle with just a little left in it after filling the pump reservoir. In real life there's no need to throw out insulin after a month. After opening a bottle I don't refrigerate and it may take 6 mo. to use it up... I've never had a problem with insulin's effectiveness.
Get the book "Pumping Insulin" by John Walsh. It's a little older and doesn't have much info on OmniPods, but it is a great resource that helps you understand how to incorporate a pump into your life. I was so nervous when I first got my pump, but got used to it in less than a day. Thanks to a pump my blood sugars are better, I rarely have low blood sugars, my hypoglycemia unawareness was reversed, and I had a super healthy pregnancy (5.1 A1c). Most mornings my blood sugar is within 5 points of what it was when I went to bed! Pumps are life changing.