Here is my opinion, as you learn to use them and you really want the absolute most out of them with out doubting anything other than what your seeing here to me is the $$ difference , The Dedicated Di in the same transducer. Once I found out that a si unit had to re write the di picture that drove me in sain just knowing it may not be correct ( although I know it's pretty darn close ) I didn't want the " middle man" re doing something so I had to have a dedicated di unit on my tm now I'm wanting SI back on my tm and with the new mega units having both it is perfect without a doubt I would take the mega.


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