It is a rite of passage that every Buzzard get sucked into the Grape Creek all-day slog-fest.
It is a pretty canyon in parts, but you may want to reconsider if you go to Grape a) under 600 cfs, AND b) while anything
else under a 7 hour drive is running. If I was a Canon City local & it was 800-1000, I think I'd give it another shot. Otherwise, I generally think that it really isn't worth the drive + shuttle from the Denver area.
PS this cool shot of Gary boofing that curler drop on merelyafleshwound.com....
.....looked a helluva lot uglier in person, at not because of any lack of Gary's paddling ability. At most flows it's a marginally runnable, fairly interesting mank-fest full of ass-shots and crimped landing zones for 200 yards, and a bumpy class II death-march for the other 10 miles.
If you simply HAVE to tick it off your list, then go for it. Personally I'd go to Upper Taos Box or even a Piedra top-to-bottom run (~600cfs right now). I've done that run as low as 500 and had fun.