Some love them, some hate them. After probably selling hundreds of them at my old shop, we ultimately moved to GreenFilter as a "serviceable" filter. More filter coverage area and it seemed like the oil is better.
We had a Ford Dealer right next to us who explicitly would tell us not to sell K&N to Ford owners. They claimed to have proven issues with with MAF's and some Diesel setups due to the oiling. I would say that 50% of the issues with oiled filters are the owners. Either they didn't let them fully dry before oiling or like others said here they would heavily over oil. No one can force you to use a specific filter, but the fact that specific claims were researched by Ford was enough for me. This was a few years back though so I'm sure much has changed.
Personally I use Purolator, Wix, or Mann, which I was told most LR filters are made by Hastings or Mann as a white box anyway then repackaged. It's absolutely up the user but that all being said I think if you follow instructions, you should not have any issues with an oiled filter. I would rather just toss it and get a new one at interval then give my LR3 any more reason to throw a code. Just my .02, but to each his own.