As much as I love the idea of budget subwoofers, at a certain point, alone, the specifications of these budget subwoofers tell one they're better off putting their budget into more sensitive mains and center channel that can dig a bit deeper so one gets more mileage out of their amplifier.
Personally, I don't think this level subwoofer will give you what you're wanting. This level subwoofer would be a great add to speakers to improve their overall performance but not a good add if expecting true, stand alone subwoofer performance.
Again, I love the concept of budget subwoofers but these subs are spec'd at 40Hz and are improving on the mid-bass of the mains and center channel as opposed to being a "subwoofer" which is expected to improve on the bass track below that which the mains and center channels are able to reproduce. Just saying. When putting this budget system together, even though a budget system, look to the best mains and center channel you can budget for and later add a subwoofer that will improve on that what the mains and center channel are capable of reproducing.
If you must get a subwoofer, please, do consider upping your budget and consider a subwoofer like a Klipsch, RW-12d or a BIC, PL-200. Your ears will thank-you for doing so.
Agreeing with kesando's question when asking, is your budget flexible?