From a standpoint: Cautiously usable, but not for banking. The Adguard pack is well-respected in the collector community (MD5 hashes often posted on MyDigitalLife forums). However, OS4World is a repacker. The risk is that a third party added a backdoor to the $OEM$ folder.
: Modern hardware compatibility is improved with integrated drivers for USB 3.0/3.1 and support for UEFI booting, which is often missing from original Windows 7 installation media. From a standpoint: Cautiously usable, but not for banking
: Use your original Windows 7 product key to activate the OS during or after the setup. From a standpoint: Cautiously usable