Agreed, I have both, but have only tried the i5 on snare, guitars, and my own voice, but I like it.
Me and a band recently A/B'd the 57, ATM25 (my previous favorite on heavy guitars), and the i5, on both a JCM900, and Triple Rectifier. The i5 won for both amps.
On snare it's a toss up, I like...