If you are translating from one European language to another European language, the translation is mostly accurate. However, if it is from English to Mandarin Chinese, the translation is horrible lol and you need personally edit them yourselves.

Years ago these translation softwares were terrible and it took longer to correct the translation than do it all yourself. Nowadays they are a lot better but in dealing with Spanish Translation Software I have not found one that is sufficiently good to not have to proof read it very carefully, These translations do not have any discretion and will translate every word literally. If the text contains proper names or towns or cities they will get literally translated. For instance the town "Little Rock" will be translated into Spanish as "la piedra pequena" meaning small stone! I hope this is useful.

If you search for plugins be sure and check whether or not it is compatible with your theme. Also, if you want to test something, I suggest that you set up a subdomain on siterubix and do your testing there first.

The one I use is google translate and it's good with certain languages and bad with other ones.

I guess the real test would be to insall the different plugins and chek hte quality of the end result Ryan. Here is a link to some of the "better" plugins.
https://premium.wpmudev.org/blog/top-6-translation-plugins-for-your-wordpress-site/