Downloaded this just to try it out. If this is what multitasking will be for apps that don't require a background process, I am not impressed. If I need to leave an app to respond to a text message (stupid anyway. This needs to be built in), when I go back to that app, I'd like it to open instantly. It should save the exact state the app was in when left, making for a quick open without any loading. I'll reserve full judgement on how this will work until more apps get updated and devs start implementing more multitasking functions.
With that being said...I don't really like the way Apple has implemented MT on iOS 4 so far.
1. There should be a way to indicate that you want the app saved in the background/multitasking group. When you hit the home button to close an app, it automatically gets added into your multitasking list. This can get quite annoying if you dont need it to be saved in the background. How about a long home button hold to close the app AND save it in the background?
2. Only 4 visible multitasking apps in the drawer, with all the others visible when you scroll? That's pretty annoying. I'm used to the Backgrounder & Kirikae combo, and being able to see ALL of your open apps at once is a huge benefit.
Again, I'll withhold full judgement until the apps/multitasking procedure is a bit more mature. For now though, I'm not too impressed.