Well there was a time (before I figured jp101 existed) when I listened to a few of their lessons, they're honest but far far far from what jp101 can offer! First of all Jp101 is fun to listen to whilst when listening to nhk..... well it's no fun
plus jp101 have a wide variety of shows (culture, news, different levels, and so on...) and voice actors (*put your favorite actors here*) while in nhk everything I heard (about 10 or 20 lessons) were only about grammar(level beginner and intermediate I think...) and done by the same woman. I sent a mail to them about 6months ago to ask if they could provide the entire archive of lessons on their website instead of just the 15 or 20 latest lessons to date because it's frustrating for newbies to begin with lesson 50 or 70 (even if it was understandable) but I got no response from them...
Anyway it's not all black for nhk and white for jp101 don't misunderstand! I loved listening to their show but now that I know jp101 I can't really go to any other place
The best part of their show is what you said they come with translation into 10 or more languages so if you're not familiar with English that can help a lot!