I've got a 425E stove and a 200A(195) lantern, both of which my Dad bought new in about 1975 or '76. They are in excellent condition - the stoves has one burner that looks rusty, but works great (I got a new burner assembly, but decided not to swap it out because it works fine), and the lantern looks and works awesome after I put a new packing in the valve. I've been using these ever since I was old enough to strike a match.
I love using this stuff: 1) they are so simple and so reliable, 2) every time I use them I'm reminded of all our family camping trips, 3) there's something about using an old gas lantern and stove that "makes" a camping trip.
My wife despises them. Mainly, she thinks they are complicated to use (turn that, pump this, strike a match, adjust that, turn that, pump more, adjust, then use...). And she thinks (and this might be a valid point) that anything we cook on the stove has a hint of gas fumes flavor. She likes the lantern, especially if she doesn't have to mess with it.
We already use a small Coleman propane grill that uses the 1lb canisters. I hate those "disposable" canisters and think they're wasteful. I'm considering a 5lb tank with a hose and adapter to feed the grill. While considering this and looking at my options at Cabelas last weekend, I came accross one of these:

Propane-Stove-Regulated-Converter
With one of these I could fuel my grill and stove off of one tank, not have the wifey complain about foul-tasting stove fumes, and still use my nostalgic stove.
Has anyone used one of these? It doesn't appear to require modifications to the stove. I just wonder 1) how safe it is, and 2) how well it works.