I went with Full Helix floor after having Helix LT for a weekend.
LT chassis didn't feel sturdy. You can see impressions of the PCB studs on the top panel - not esthetically pleasant. The panel shows fingerprints early, when touched. The pedal looks and feels light duty. The LT doesn't have a microphone input, so there would be a need for extra equipment if you need a mike for recording. I liked the performance display though.
I traded my gear (13 pedals, two pedal boards, Pod HD PRO X Rack, Pod HD bean, etc.) at Long & McQuade for Helix LT on Friday. On Monday i returned it and I got a Full Helix Floor. The build quality of aluminum is superior. the finish of aluminum cast is top notch.. Helix Floor is more future proof and versatile..