Kingsoft offers 2 versions of their Office suite, Free & Professional -- there's a comparison chart here - http://www.kingsoftstore.com/windows/professional-office-difference
If you open the Product Management Center app you'll see the license data for your installed copy. Depending on the giveaway -- it's been on a few sites -- you normally either see 1 year or Not Limited. I **think** the 1 year license versions *may* have more in the way of things like macro capabilities, but as I don't use Kingsoft (or any) office apps often at all, I could be wrong. Today's GOTD [the license terms say it's the Pro version] initially showed the product was not licensed or registered when I 1st opened the Product Management Center. I opened Kingsoft Writer searching for a way to activate it, & when I opened the Product Management Center from inside Kingsoft Writer, it now showed Not Limited -- opening the same Management Center after shutting Writer down now showed Not Limited as well.
Kingsoft office has always reminded me of earlier versions of Microsoft Office, particularly Word. It does not, nor does it pretend to do everything that Microsoft Office can, but OTOH most people don't need all that either -- I think Microsoft tacitly acknowledged this when they put a version of Office on-line. Both Microsoft & Kingsoft have free versions for Android -- https://play.google.com/store/apps/details?id=com.microsoft.office.officehub & https://play.google.com/store/apps/details?id=cn.wps.moffice_eng -- Kingsoft's site says they're working on iOS while Microsoft recently got their version up in the App Store.
Alternatives [besides MS Ofc] include WordPerfect [now owned by Corel], who also sells a lower priced home & student version -- you may find the best pricing however on surplus OEM discs if/when you can find them [I've paid less than $20 in the past]. Ashampoo also sells office software -- if you've used Ashampoo stuff & get their e-mails you know how variable their pricing can be... wait long enough & you'll usually get a pretty aggressive discount. And of course there's the closely related, and free, Open & Libre office.
Kingsoft Office is not a low impact installation -- if that's what you're after portable apps.com has Open & Libre Office suites -- but it's not as bad as the suite from Microsoft. I recorded:
The installation performed the following activity:
1328 files added
1 file deleted
16 files updated
29097 registry entries added
428 registry entries deleted
207 registry entries updated
Personally I won't/don't add Kingsoft Office to a copy of Windows that already has software installed that uses Microsoft Visual Basic for Applications -- that includes the MS office apps & quite a few programs from Corel, including WordPerfect. Why? When I monitored installs Kingsoft Office changed as well as added to an existing VBA installation -- I'm afraid both of potential conflicts & breakage. IMHO debugging a spreadsheet macro is bad enough, without having to worry about introducing some weird bug.