Not bad 5 3

I agree with the comment Galinetto but I would not be as radical on the note because it depends on what you compare it.
Regardless of price:
Compared to an iPhone, so the note is final, it is painful to see and do that deserves 1/5
Compared to a recent Gigaset as 780 (A beautiful building by the way), it's still not bad and deserves 4/5
But when compared to other brands with their full Plastoc screens 80s, so there can be awarded it 5 stars.

Already aesthetically it exudes quality, the grip is excellent, it is just class.
The sound, we never talk, well, it is excellent, of course, I would have liked a physical volume button, but here is good, that remains fixed, somewhat competitive market where manufacturers do not tread much.

Quick Sync is actually a joke for a 2012 product, I give you an example:
In the directory we have: photo, name, surname, 5 numbers and birthday.
On Mac, we can draw the contacts to QuickSync, friendly, except that:
Photo, Quick Sync the matter but did not transfer to the terminal. (I find myself having to contact my photoshoper 320 * 225 and then having to transfer them to the phone directory)
The numbers, it is important that by 3 contacts while it has a capacity of 5, will understand.
In short not top QuickSync: We may one day dream of a seamless sync with WiFi or Bluetooth, or better iCloud.

So let's be clear, the SL910 is currently the best sets of walking but especially the most expensive.
Many things are missing, but when you see the other brands, we are happy to have a Gigaset :)