When I priced out my boat I looked at bot the merc 700 and the Ilmor and Lavey would have built the boat with either for the same price.
The 700 merc would have come with an NXT
The ilmor came with a teague platinum and an ITS
I love my Merc products and have nothing bad to say about them, they have been good to me for decades and Ill continue to consider them every time based on a lifetime of love.
What I really liked about the ilmor was 2 things
No blower- Ive had a lifetime of f-ing with blowers and cleaning belt dust from my engine compartments, I know how good the new injected blower rigs are but it is what it is.
About 150-200lb lighter. - Ilmor is all aluminum
One downside was that the Ilmor had no NMEA 2000 compliant computer- they have addressed that with the 725.
Other considerations for me were-
Teague 800 - no fresh water cooling
Raylar 750- incredible beast -& the best looking package available - awesome but rare.
Ill never take anything away from any of these other fine marques, and simply feel after owning and using one now for about 40 hours that Ilmor is among the best in every category.
No one should shy away from an Ilmor powered boat.