I'm a gut/poly guy, specifically 17g Pacific Classic / 18g MSV Co. Focus. I think the gut helps soften the frame a bit, seeing as how it is more firm than my Pacifics. I tried Tier One T1 Firewire (full poly) last night as an experiment. My initial impression was 'eh', but I'm reserving an actual review for when I can get out on the clay (it's been raining/drizzling in the Mid Atlantic for 3 days now). Tension should most definitely be in the low 50s max. I'm down to 53/51 for the gut/poly, and strung the T1 at 50 even.