Low time in airplane type should always be a caution for any pilot, regardless of their total time or experience. There is a reason why the airlines and the military utilize the High Minimums concept when transitioning from jet to jet, even with decades of experience and thousands of flight hours annotated in your logbook.
IMHO, the 700-800 hour experience level can be a problematic period for pilots. Speaking from experience, you are no longer a "basic" student pilot and may overestimate your ability to safely conduct low ceiling/viz approaches, over perform the aircraft, etc. As experienced aviators know, your window of comfortability expands/contracts based upon your time in type, recent currency, health status (colds, sleep patterns), flight route hazards/terrain, local/cross country flight, past experiences, etc.
IF the NTSB determines that Roy Halladay's own actions contributed to/caused his death, that would be tragic since he leaves behind a wife and kids. It wouldn't be the first time this has happened, nor, will it be the last.
Fly Safe,
d4d
"Advanced" student pilot