A:AnswerThe answer is not quite that simple.
Yes you can use it to access the internet for a singular device. However if you are expecting to connect multiple devices, such as cellphones, TVs and Amazon devices. This will not fulfill your needs by itself. You will need a router and wifi access point. Router & wifi can come in combo devices such as this device Linksys - Max Stream Ax1800 Model: MR7350.
A:AnswerYes it works well as long as you are at or below the 100-150 mBps service option. And you will need to call customer service to give them the CMAC address and serial number… It will not do the self-setup option.
A:AnswerThis modem requires a CAT5 IP Cable connection. It does not have a WI FI transmitter built in. Your router may provide that functionality, many do.
I am not familiar with Sparklight, but generally if the input from your ISP comes over a coax cable, I would think it is likely that this will work.
Why not ask them?