lots of people wanting to downgrade lately. lots of dumb people.
aside from the numerous warnings about downgrading, there is also no reason. sure, you might have lost your hacks because you never disabled wiiconnect24, or managed to update without thinking for whatever reason. but 4.3 is hackable, and perfectly compatible. in fact, i used modmii and MMM to upgrade my wii recently. no issues that i can see.
but that was just housekeeping. i use UNEEK+DI primarily.