FWIW...I bought a MK Terrova with iPilot, US2 transducer this year. I installed it at the end of Feb so I've used it for 2 months. I also have Lowrance Electronics but mine are older Gen 1 HDS units.
I had no plans to link my electronics to my TM so I didn't feel a need to get the iPilot link. To say I'm happy with my choice is an understatement and have 0 regrets. For me I like having the US2 transducer. It's just a neater, cleaner set up. If I really wanted to link electronics, I would have added a Bird unit up front or just switched everything to Birds. I can see an advantage to linking the units to the electronics for some styles of fishing.
I initially thought I would miss the manual steer foot control so I was a little leery about going to an electric steer. That's not the case at all. I find myself using advanced auto pilot, spot lock and spot lock jog the most. I use the remote 99% of the time and rarely us the foot pedal. I like the MK remote because of the screen which the MG didn't have a screen so you had to link it to electronics to see what was going on.
If I felt like I couldn't give up that foot control I was going to go with the Ultrex.
Going to MK was quite a stretch for me because I had used MG most of my life and the TM I removed was an 8 year old MG Tour. I'm glad I made the switch.