No problems... Apparently, sup'ing up and accessorizing is not limited to cars and computers anymore.
"One of Amazon's most popular technology books last month was Hacking TiVo. The book's enormous popularity intrigues me because of what it says about TiVo digital video recorders: 1) Geeks love TiVo; and 2) Many of these same gadget-happy TiVo owners are not satisfied with TiVo in its off-the-shelf incarnation."
Apparently, WeaKnees.com, a TiVo upgrade and parts company, has created a Series 2 system. This article talk about the upgrades, and the pros and cons. Good stuff.