IMO shaving with a disposable is sort of like shaving with a product made by Fisher-Price. More of a toy than a precision instrument.
If I have been on a trip and forgot my HeadBlade, I will buy a Shick Xtreme 3. That seems to work well for me. But everybodys scalp and hair condition are different. But then again, I can rub a bar of soap on my noggin and get a great shave if I don't have some HeadSlick around!