Is TiVo really worth it?

I was considering purchasing a Roamio Pro TiVo unit with several minis so I could have whole home DVR service. Right now I'm a cable subscriber and I have to pay monthly rates on my set top boxes which included 2 dvrs. What I am obviously wanting is whole home dvr service with the ability to watch and play back any recording on any tv. So I call TiVo up and I'm asking about pricing and I find out even though you purchase the equipment, which is expensive I might add, you still have to pay a monthly subscription on each device you have. I honestly think it's a complete rip off. Any thoughts? Thanks!