I also own one of both the 30 hour Replay (the Panasonic-branded
ShowSnotter) and a Tivo (hacked to 90 hours). Overall, I like
the Replay better. It'd be a no-brainer for Replay for me if
1) they got rid of the Macrovision on the Showdorker version and
2) it was simple to hack it.
What's good about the Replay: 30 second advance button, slightly
better quality at crummiest setting, ability to record a show
only on-or-around a particular time/day each week, can be turned
off (no disc access noises if you have it in your bedroom).
What's bad about Replay: No _easy_, _proven_ hack at this point;
doesn't flag you immediately if you set recorder to record two
shows at the same time; Showcr*pper version has Macrovision
implemented which makes it impossible to record from pre-recorded
videotapes or DVDs (well, unless you have an Apex or the like--ha
ha!).
What's good about Tivo: Can *easily* be hacked (not so--at least yet--
for Reply); menus look nicer, won't let you attempt to record
two shows that occur at the same time; easily accessible list
of shows that are cued to record.
What's bad about Tivo: Record options not easily modifyable once
show is in record cue; can't turn the d*mn thing off--lots of
disc access tics to lull you to sleep

; no Macrovision
problem; slightly worse quality at lowest quality; pain in the
buttinski to delete a lot of shows (each show has to be deleted
individually using a bunch of keystrokes).
A lot of these differences and problems can/may be fixed with
susequent OS upgrades.
Kwad