For those want to know more about dual sim,

today try it and found out that call log indicator call from which sim is too small with a number "1" or "2" not like P770 different it by using color and name which set in sim management. for uncle like me is a bit difficult to see!!

SMS still ok coz there is a sim name display on right bottom corner but also without color. P770 got name and color without number!!

good thing is P780 got a new function that SMS and Call ringtone can be set by different sim. means sim1 & 2 can have different ringtone and sms notification.

I tested this in S116 ROM dont know the S115 ROM having the same problem?

RAM still a issue like P770 coz both using 1GB RAM but this time lenovo launcher add a cleaner function but dont forget to set white list in preference!! if not, you will found some of your program not function well after clean ram

the lenovo power is the best improvement!!! can manage and whitelist or blacklist so many things and so stable compare with juice defender i use in galaxy s2!!

there is few whitelist in P780
in launcher preference is mainly for clear ram... so those calendar apps like biz calendar or clock widget, sosial apps like wechat or whatapp, email apps like k9 mail or outlook better whitelist it... so after you press the cleaner widget those program will not close

the other you need to on in manually in lenovo power setting

one is lock screen network whitelist (if you on the lock screen network, it work like juice defender that cut your network while go to lock screen) so you need to whilelist above problem in order you still can received you msg or email while lock screen. 

the other one is lock screen memory clean whilelist (if you on this , it will clean your ram while lock screen) so same it just like you press cleaner on desktop, but this this while your phone go lock screen it will auto clean your ram so same thing you dont want them to clear your calendar, sosial or email apps.