I have never heard them but I would feel very safe saying no, these are not good speakers to use for monitoring. I would guess they might be the worst option actually.
You'd be much better off with headphones.
That is not because affordable monitors aren't out there the issue is the 5.1 and the way home theater systems are designed to work. Very exaggerated bass, etc.
I'm gonna get a pair of these for outside (long story) for example:
Mackie CR Series CR3 - 3" Creative Reference Multimedia Monitors (Pair) https://www.amazon.com/dp/B00KVEIY4E/ref=cm_sw_r_cp_tai_CMOxzb7V26HJ5
They won't be very good, but don't get the job done for my limited purposes & are only $99 bucks a pair. So that's one option. The other option is just a decent pair of home stereo speakers would be a better way to go. Pair as in only two speakers.
For more input on what kind of monitors to get I would recommend you read the article on this site. I believe it's called "Top Five Monitors".
There are several articles on Equipboard covering this and all sorts of other topics that offer very affordable solutions. If you've got no cash, I'd say repurpose some home stereo speakers if you have them or maybe hit a Goodwill if you don't.