Is pentax k a good system to buy into?

Here is what the site says about that.

From Pentax K-500: Pentax K-500: A DSLR by Pentax with a 16.3-megapixel APS-C sensor, announced in 2013. The K-50 without weather sealing.

From Pentax K-S1: Pentax K-S1: A DSLR by Pentax with a 20.1-megapixel APS-C sensor, announced in 2014.

Quoted from this site's pages.