I like my Grim Reapers a lot. Never shot a deer with them, but I shot a rabbit the other day and they opened. I figure if they'll open on a rabbit they'll do for deer. I've been thinking about switching to Muzzy MX-3's though. We'll see what happens, but I like Grim Reaper's.
I don't like the Spin Tite stuff. I bought their Crimson Talons a couple years ago and I hated them. Shot them into my block and the blades ripped right off.
Ever since that they've left a sour taste in my mouth.