It's cheap chassis designers that are responsible.
Excellent handles:
-LQD lambda power supply, leather strap on top, very nice riveted into the chassis. You even retain it if you use it in a rackmount configuration. Those LQD supplies are one of my golden standards for good chassis design.
-Older HP-Tower style meters (i.e. their ACvoltmeter). So long you replace the leather handle its real nice. Stacking tube gear is just dumb anyway.
-Tektronix instruments with the bale. Pretty decent. The nicest one I have for a tektronix that does not interfere with the stacking is the CFG280. It tucks in under the rubber feet. It has to tuck in under the rubber feet or you can't stack it without fucking cribbing. Fuck equipment that does not tuck in the fucking bale under the fucking feet god damn.
-Tektronix 70ps pulse generator (forgot the model number): This is fucking beautiful. There is a handle that blends into the front of the instrument. It's also able to pull the inside of the instrument out for repair when you need to repair after a thumb screw on the back is loosened. It's probably the best design I have seen for small test equipment.
-Tektronix P6042 current probe: very similar to above. Beautiful.
-Agilent E5100 series network analyzer: real nice too, kinda like the lambdas and it fits snugly into the side so you don't need to worry about it not fitting because of the carry strap
-rigol 1052e : real nice blends in 100% to the top. You can coil your probes and leave them ontop of the oscilloscope even if its tucked in under a low bench.
Medicore:
-Sorensen/Xantrex power supplies: small nylon belt off to the side. It works but its very minimalist and crappy
-1970's HP spectrum analyzer etc: the fucking handle works great but it does not tuck in under the feet so you end up removing it to use it
-Wavetek278: There is a handle that sticks out the front no matter what you do. Its always ready to grab (part of the rackmount set). I don't know how to feel about this one. On one hand its really robust, it protects the power switch and the bnc connectors a bit, on the other hand its always in your face and it sticks out like 1.5 inches. It's ready to grab off the shelf to clobber alien invaders I guess. If they had it on both sides it would be better even if its more intrusive because then you can drop it out on the front face and its fully protected. I don't really mind D handles that stick out the front of a instrument because often it will get good protection from this.
Keep in mind your not supposed to really stack that shit for thermal reasons.
Remember if you design a tilting bale: UNDER THE
TALL RUBBER FEET PLEASE