Ballistic for me! I support the guys at Millennium here in Wisconsin. I have them in every bike I have plus a fully charged spare for race day. Use the Advanced charger once in awhile and everything is good.
My R1 likes to drain the battery down if left un-tended (is that a word?) for a couple weeks. Don't have a key switch or any street equipment so it probably isn't a "park" setting thing. Even my Zuma will drain the battery down eventually. I put leads on them all and plug them in every so often. No worries and no issues. Some of these Ballistic batteries have been in service going on 4 seasons. If they are kept balance charged, they last a long time.
STT Staff Instructor
MV Agusta F3
Aprilia RSV4 Factory
Yamaha R1 - Woodcraft, STG, Arai, Apex, Sidi, FT, Yoyodyne, MotoUnion