Wow. What a quick response!
I'm not sure how old the Countryman's are but I know they are long before my time working at the university (2010). We've had every kind of failure out of them: plastic XLR connector breaking apart, super small ribbon cable breaking/coming un-soldered, and some that appear cosmetically OK but don't pass signal or a have a nasty buzz. I don't think we've ever used batteries in them and we use all Neutrik X series connectors on Clark MINK4 cable for XLR's. Apart from being used 3 times a week, they are not abused by any means. We take good care of our gear.
I like the idea of having a few active DI's on hand for certain applications and for the Radials, the JDI and J48 are at the same price point. I also like how the Pro48 has a phantom power indicator light (speeds up troubleshooting). Apart from the extra features on the J series Radials, are they basically the same sound as the Pro series (passive and active)?
Thank you for all the responses!