You mean ASPERGER's staging?
Yes, that one where you split the fuel into increasingly small tanks and drop them one by one.
I also don't use it anymore, since it was such a pain in practice. Also ION engines have become so much more useful, there is not really a point any more. At least if you get your probes extremely light, ION drive is way better.
No matter what engine is used, my personal MaxDeltaV ranking would be:
1. single engine, Asperger Staging (-if you get it to work) (-insane burn time)
2. single engine, huge tank (+easy to build) (-insane burn time)
3. multi engine, huge tank (++improved burn time)
And I use stages in this order:
Last: ION (almost "unlimited" deltaV)
2nd last: LV-1 micro propulsion system. Can give a "free" push of some thousand m/s, if the probe is light enough (<1t )
3rd last: NERVA (afaik there is nothing better for interplanetary transfer)
As I wrote on the last page, I am working on a design that combines ION and LV-1 in the last stage.
The advantage is that LV-1 has reasonable thrust, while Ion can be used for almost free course changes, on long flights.
The only problem is how to get rid of the LV1 and tanks if it's empty, but that is mostly solved-
The two LV1's and Ion drive can work at the same time, or I switch one of them off during flight. Once empty, the chemical engines drop sideways, and the ship can cruise on with the Ion drive.
Together with a NERVA stage (4t fuel) the complete ships weighs 10t, and gives deltaV between 13 and 20 km/s (depending on when I drop the LV1+tanks).
Here you should see the basic idea.
And with Solar Panels extended: