I managed to get onto the store when I got home, and picked up the plus version. First impressions: it's a great update. I love the new toolbar, and overall it's very good for usability. Nice and fast too, the graphics are excellent, and sky tracking works really smoothly now.
- Why have separate gyro/compass options? I'm struggling to think of a reason why I'd want one but not the other!
- The "tonight's best" screen. Sorry, but this part was a bit of a let down.
First it's kind of hard to find (it isn't really a 'search', neither are the observing lists, maybe if you get gyro/compass down to one button you'll have space to separate search + viewing lists?)
Second, it's just a huge mixed up list of objects. The 'tonight' list is one of the great features of starmap pro, everything is shown grouped by object type, and then ordered by magnitude, and it shows them all with rise/set times. In sky safari it's all mixed together, I'm not sure at all how it's ordered, and there's no indication of what is visible when (some objects are greyed out, maybe they're below the horizon right now).
Overall though, it's an excellent app, and I'd definitely recommend it. Especially at current prices, but even doubled it's excellent value. The feature set is great, and it's really good to use too.
(Oh, and I've just used it on my iphone 4 so far, not tried it on my 3gs or ipad2 - I'll speak up if there's anything to moan about / praise there too