I have that bird unit... But with the Di feature...
I give it a 4/5
Only negative is the GPS... And I haven't done a software upgrade since I bought the unit...that might solve some problems...
sometimes has a hard time picking up signal... I've started turning the GPS on before I leave my house... Gives it plenty of time to get connection and it always works after that....
Speed bounces around... Even when parked in the driveway... I've learned to read speed like the matrix...lol... It's usually showing the right speed... Just bounces up and down...
Positives...
You can get the portable kit for ice fishing...
Sonar is awesome...
Di is worth the $100 if you can afford it...
No cable base for quick and easy installation and removal daily...
Very user friendly... Easy menus... Even my dad can operate his new bird unit... Lol