Fishfinder with DI... Useful?

[IN2DEEP]

I'm looking to get a FF very soon

I was wondering if the "down imaging" feature that both the Humminbird and Lowrance units offer, have been useful for those of you who have them

I'm more leaning towards the Humminbird model (598)

Someone told me that the DI feature drew the battery down while in use... true?

And that you can't see fish readings in the DI mode (but you can split the screen to run normal & DI simultaneously)

It does look interesting to me, especially for FW lake fishing



Thanks for your input

BTW, I just picked up a PA12 yesterday and excited to get it rigged and fishing