You can get a good deal if you directly with someone at Everlast (like me).Our warranty is the same for all products sold through authorized distribution centers/dealers. Amazon is one. We, of course are another, which is direct from the source. The last major update was earlier this year...but we always are making additional improvements we don't publicize...same as everyone else.

If you look at Jim's thread, (use new posts button to check for the most recent update tonight) you will see cut away images that shows the penetration.

The 250EX has one waveform: Advanced Square wave.

The ext has been carefully laid out and worked through so that the basic controls are easy to access, and little or no bottlenecking occurs with the selection/adjustment procedures.