YMMV, but as someone who has had an expanded TiVo through multiple generations over the past 13 years, and who has seen the company be really respectful to a hacker community over those years, the reward was worth the risk to me as well. There's no way in heck I would try to remove/replace three months of recordings via PyTiVo/Kmttg. Too much hassle/time. I saved $30, have a 1TB to use elsewhere if I want, and I cross my fingers there's not an issue. If in any way you are squeamish about upgrading a Plus immediately, vs after the warranty period, I would recommend just spending the extra $30 and get the Pro.