Great and surprising features

Wanted my old Gigaset 3035 (plus handset) replace last and was looking for because of my previous satisfaction for a newer and Gigaset am because of good reviews in the C430 A stuck.
I think all great: intuitive, hands-free on all handsets, AB on all handsets and ever: see who is calling on the handset and who called (could my old handset is not everything).
For me, a surprising feature: baby monitor! Show your love (bought and used 5 month old baby and so far no baby monitor, but when it is, it can also sometimes be used: o) ...).
The "sound" of the phones is great, there are a lot of ringtones to choose from, and so on ... Can anything be found negative, so strong buy recommendation with 5 stars.