Harddrive capacity and recording time

Thinking about buying the Roamio that will record 4 shows and has 500 hours.



I now have the TiVo Premiere XL. I thought that my currant tivo records 150 Hrs and has a 1 TB H.D. Is that correct?



Can I ck on my currant Tivo to verify my HD size and recording capacity?



Also I understand that I can transfer my recorded shows from my old to the new one. Is that correct?



And does the new Tivo have built-in wifi?