Ah shit, lets see... I played 7's exclusively in freshmen and sophomore year of HS, so early 2005 to mid 2006. I got rid of my last one for that bit in the summer of 2006. Summer of '07 I bought an RG1527 off of Buz from Unearth, sold it within like 2 months. Bought a Carvin 747 in January of '08 but returned it because the case it was shipped in somehow caused moisture to form during shipping and rust some parts out. Got an RG1077xl in January '09 because I had always wanted one and figured if I'd ever like a 7 again, it'd be a baritone.
And then this one, got it a few weeks ago and just absolutely cannot vibe with 7's - this will be the last one, I'm sure. 7's are sluggish and dull to me, and I only write breakdowns on them. 6 strings in B? I write songs. 7 strings? I end up just chugging away on the low string. Plus, the tone is never as good as a 6 string, which really sucks.