I've had my new XL4 for about a week (replacing my original S3). The 4-tuner goodness is pretty amazing, with 3 or 4 of them churning most of the time. I am only at "12% full" but have a mountain of programming to watch, with over 100 suggestions among the MANY scheduled recordings. The suggestions engine is matching my preference pretty closely, after a couple rounds of adding thumbs-down to stuff I did not like. I cannot imagine this TiVo getting to >50%, let alone 100%! Yikes.