I have been shooting Muzzy 4 blade 100 grain broadheads for years and do not have any complaints. Fly just like my field tips, replaceable blades and tough as nails.
Not saying G5 heads are bad, I just have never used them. I bought a 6 pack of the Muzzy's with a pack of replacement blades a few years ago and havn't had to buy anymore!
From what I understand, G5 broadheads are great. I have also heard some great things about Slick Tricks. Hope this helps!