I went to our local mountain yesterday to meet my cousin and since we have the same boot size...we get to ride each others skis:
Weather: 45 degrees
spring soft snow on all trails
uneven conditions with 3-5 inches along the edges
Me: 5'8" 156lbs, advanced skier
168, BMX78: I thought this a worthy test as I own the MX78 and FX84's...I snapped into the skis trading my 84's with my cousin. He had the Kastle binding mounted +1 and no interface. First thing I noticed is how light they felt and how easily they moved edge to edge. They do not have the energy the MX78 has. They felt much more tame. The BMX78 underfoot felt stable in the soft snow. In the clumped up, I did notice more deflection than I would have experienced with the MX series and considerably more than the 84 has. This ski loves to carve up the soft snow feeling much quicker edge to edge than it's width might imply. All kinds of turns from short to medium to long GS turns are easy for the ski and it feels fairly stable in these turn shapes. Brush turns, drifting...all easy to do. My cousin just passed his National Saftey Patrol test and I think this ski with it's turn ease, snow versatility and lightness will prove to be an excellent work horse. The ski also performs well in soft bumps, no MX78 tail kick to it. The BMX does have early rise tip. I did notice the 84 shovel feels like it pulls stronger into the turn than does the 78. My thinking was that was becuase of how the different shovels engage. In the conditions we were skiing, both turn entries felt comfortable it's just that the BMX entry felt a bit muted.
Afterwords, I got back on the FX 84 and in comparison, it felt much more solid underfoot and in the heavy crud along the edges, was more stable especially when I picked up the speed.
Still all in all....I found the BMX 78 very easy to ski and would recommend it for any light weight male or female intermedite to advanced skier who wants a fun, quick, versatile, playful stable ski.
G