I used the version already in 2014 and after some time I was able to remove it and then reinstall because it mukkte easy ...
Well as fate would have it so failed to 3 times the 2014 version with me and just on this day the publication date for Version 2015. So I was set-up level in 2015 on "Day One" of the final version.
The Surface:
The surface has (color) changed only in design, and a more gentle (denglisch: Smoot Heren) operation or visualization changed.
!!! The options for adjustment have not really changed for version 2014 !!! So whoever hopes for the much better setting options from prior releases of 2014, hoping in vain.
Stability:
I did not have to since (what are now?) 3 months reinstall, so much better and without bugs Version 2015 (at least for me).
Performance \ resources \ recognition rate:
Is great! The Bitdefender keeps comfortable with in terms of recognition, but this works with 2 "scan engines" and thus consumes more power on most systems (GData uses the same engine as BitDefender, ie in which one of these two product was not running, run the other neither).
Recommendation for installation:
The old scanner with the manufacturer-removal tool (best in safe mode) remove (even those on KIS 2014!) Then reinstall only. To this end, please always better to use the latest downloadable version, because even this is not the most current ... there are about 100 MB anyway recharged ... ALWAYS. In between, after each completed (un) installation process or restarting the computer.
Annmerkung:
Load and test trial. After one month decide to buy, or uninstall.
There is only the complete package with KIS to download and install ... Moving On Product Key if only the AntiVirus is activated, or additionally, the Internet Secruity nioch functions.
My system:
Win 8.1 Update 1 (always the latest patch level)
I5 3210m 2.5GHz
8 MB Ram