A few things to keep in mind while waiting for Beta 4:
*In Beta 3, the Simulation Start and End do not really work correctly if your animation does not start on frame 0. The simulation loop is currently hard-coded to start on 0, but this has been fixed for the upcoming Beta 4.
*In Beta 3 and earlier, the transformations of a FumeFX grid are not taken into account correctly. So unless your FumeFX is at the world origin, Stoke will probably not get it right. We are looking into this for Beta 4.
*Stoke seems to work great with FumeFX 3.0.2, but appears to be broken when using 3.5.1. We are looking into that.
*In Beta 3, there is a known bug with particle Viewport Display switch in Max 2012. Please use Max 2013 for now if you can.
*In Beta 3, the filters of supported Forces and particle systems are hard-coded. In Beta 4, any Force SpaceWarp and any particle system will be correctly allowed as Velocity Source, and any Particle or Geometry object (including Spline with Renderable on) will be accepted as Distribution sources.
*In Beta 3, all Stoke objects write to the same folder, with the version sub-folder providing a unique location. In Beta 4, a random ID sub-folder like Stoke_12345_67890 will be generated per Stoke object (similar to how FumeFX generates random folders), so the version sub-folder will apply to the specific Stoke object, and each object can have its own versions from 1 to N. The ID will be stored in the object and merging a Stoke into another scene will correctly set its path.
Beta 4 will also finally add sub-frame sampling, and I just wanted to tell you how much fun you are going to have with it! 
Here is the PFlow from the last cache video demonstration, simulated with 1000 particles per frame, grid size 5 and Fluid Motion on. This is what you would get from Beta 3. Red circles are PFlow, blue lines are Stoke:
[attachment=2]STK_Beta4_SubSampling1_v001.png[/attachment]
Now compare to the orange lines which are Stoke Beta 4 simulated with 2 Sub-samples per frame:
[attachment=1]STK_Beta4_SubSampling12_v001.png[/attachment]
Finally, the yellow lines show the results of 3 Sub-samples per frame:
[attachment=0]STK_Beta4_SubSampling123_v001.png[/attachment]
The sim. times were as you would expect them - 2x and 3x longer:
[code]–Generate Time: 0.086 sec.
–Advect Time: 0.423 sec.
–Update Time: 2.036 sec.
–STOKE Total Time: 2.907 sec.
–Generate Time: 0.182 sec.
–Advect Time: 1.561 sec.
–Update Time: 4.246 sec.
–STOKE Total Time: 6.472 sec.
–Generate Time: 0.284 sec.
–Advect Time: 3.402 sec.
–Update Time: 6.248 sec.
–STOKE Total Time: 10.725 sec.[/code]
Stay stoked!