So, you're saying that VoIP isn't worth it for private use but what you linked is a VoIP service. That said, I completely disagree. VoIP is worth it for personal and business use and is the future of where phone service is going anyhow. Copper analog lines are quickly becoming a thing of the past. The service you linked looks to be about $20/month (plus taxes).
I would suggest that you check into Ooma. I have been using Ooma for almost 8 years with no issues. I pay for the premium service, which runs about $10/month ($120/year billed annually). The only thing you HAVE to pay for (here in the US at least) are the mandatory government regulated fees like the 9-1-1 fees and taxes. Otherwise, the service is technically free once you purchase the equipment, which typically runs about $120 here in the US.
You can check them out here:
#1 Ranked Free Internet Phone Service | Ooma VoIP Phone