I eat, I will do 2 units of Humalog. I for one, would much rather a quick prick. Wearing the pump all the time can be a little bit of a pain but that is not a big deal. It isn't heaven, and is about the size of a pager, a little bigger. I personally don't mine if people see it and ask questions about it, though I do try to make it not too obvious.
Many people glancing at it mistake it for a pager.
I am not familiar with the Disetronic at all so anything I may say about the pump is about the Minimed though both pumps probably are quite similar. Like I mentioned, it can be taken off for showering and swimming or if one needs to take it off for some reason, but remember when you do, you are missing your basal rate. Those are the two basic terms for pumping really. I use Minimed's sof-set micros. It's pretty painless, really.