"We pride ourselves on our engines durability and feel our engines could fit your needs, our engine here in the USA typically run 300 hours before needing any work, we recommend oil changes every 25hours, these engines are relatively simple and can be maintained by any competent marina.".
On top of that, he offered to train my local shop, so that I would have an Ilmor trained mechanic/shop close by (I live in Denmark). Mercury and Ilmor both have a 1 year limited warraty, but again, many have major issues with Merc, even over little things. They will usually try to pass it on as something you or a third party did, I know they did, when one of the exhaust manifolds failed within 3 months on my brothers 496HO in hes boat. Just do a search here, and you can find plenty of Merc customers with problems.
When it comes to fuel consumption, the Merc 700 uses about 70 gph wot, where as the Ilmor uses 50 gph wot.
I hope this answer some of your questions.
C_Spray, ILMORDude and ILMORGirl on the board are also very helpfull with info. I'm sure they be more than happy to answer any questions you might have.