Having tried the new "Premium" Lionel fluid, I still prefer the previous fluid (6-62909) on the basis of odor. Actually, I alternate between JT's NADA and the Lionel 6-62909.
I have laid in a copious supply of the latter to be on the safe side. 
Although a minor inconvenience, the old bottles did NOT require cutting off the tip! 
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I think a number of the bottles leaked, so they went with the factory seal.
More than likely Lionel's corporate attorneys, ever mindful of potential litigation, told them to SEAL the bottles! 
....... so they went with the factory seal.
Oh yes, the factory seal.
(I know, you can't believe anyone would be this stupid. You were wrong.)
Having no sense of smell, I prefer the new premium smoke fluid Lionel is offering. It's the best smoking fluid I've ever used.
My experience is that the premium smoke works as good if not better than JT. My Legacy 844 out smokes anything I have using it.
The biggest problem is it goes fast and one must keep the engine well supplied. I am finding that on some engines the wicking seems to char quicker to the resistor. Not sure if this is the fluid or just not having enough in it.
Ive removed the dropper and just use the Lionel pipette to suck it out of the bottle.
As I read the other thread about this topic and saw that people were having better results with the Premium fluid I ordered two bottles myself. As a matter of fact they will arrive today.
I will be curious to see how it performs in my Legacy steam engines.
The new Lionel premium fluid does tend to run out and needs refilling faster than other brands. To avoid wick charring, I usually refill when the smoke output noticeably starts to decrease. I also do a generous refilling at the end of each run session to let the wick soak up a good amount of fluid overnight.
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