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I'm also a Kadee #148 whisker guy. I find them to reliably couple and stay coupled. Also they uncouple better with my Rix uncoupling tool than the couplers from the various manufacturers.
I believe Kadee makes a whisker coupler which is more to scale but it's my understanding that they are not as reliable as the #148.
I haven’t had any issues with MTL couplers. My entire collection uses them. I’m using the prebuilt ones. They’re more expensive but less hassle of trying to assemble them.
I recommend Kadees as well. With the exception of a few things that needed on of their more specialized models, I almost exclusively use their No.5s and 148s. I have some equipment that still has some other makes, but I've been working on upgrading those to Kadees also.
I haven’t had any issues with MTL couplers. My entire collection uses them. I’m using the prebuilt ones. They’re more expensive but less hassle of trying to assemble them.
I have used them also but the cost is now more than double compared to when I first used them. Most N scalers do not use the magnetic decoupling feature preferring to use a hand pick of some time. I have since started to use the Kato 11-702 couplers wherever I can. All my passenger trains have them and I am starting to convert my freight cars. One nice feature is that they will couple to MT's.
I’m well stocked with MTL prebuilt couplers. Purchased a large quantity of each length of couplers. The biggest issue I have is finding Intermountain metal wheels that I prefer. They seem to be plentiful when I don’t have the extra money and darn near unobtainium when I have the extra money.