BTW, I noticed there is a new Mill from Grizzly, the G0704. So here's the blurb I added to the original post:
BF25, G0704, LM25, etc: The machine itself is about 100 pounds lighter than an X3 -- that's not a good sign for rigidity. But pound for pound, the design should be slightly more rigid than a x3 based on the boxed column on the bf25. The base is about the same size on the bottom, but much less beefy. The table is larger and so is travel, but that saddle looks very skinny. I doubt the table will hold the 150 pounds that the X3 will. The X3 is also taller. The X3 Throat is almost 2 inches larger and it has a bit more spindle height above table. Drilling capacity & end mill capacity are only 3/4 that of X3. Dials are calibrated .002 compared to X3 .001 and .0005 on Z. All in all, I get the impression that this mill is lighter duty than X3. I place it somewhere between the X2 and X3. However, the larger table size and travel is a big plus, as is the lower price. Recommendation: Nice mill, if you've been considering a X3 or SX3, this mill should be given serious consideration.