Normally I dive with my VT3. Last week I also took my Geo along for a deeper dive, basically as a back-up. Right arm VT3, left arm Geo.
My Geo went into decompression after about 17min, while the VT3 didn't. After 17min the VT3 was at TLBG 6, at 19min at 7, at 32min back to 6. Both computers...