I haven't tried it, but I looked at the Gud line online and wasn't super impressed with the ingredients list. The three varieties all have highly similar ingredients, mostly plant extracts as far as I can tell, along with some sunflower oil, plus cetearyl alcohol and glycerin (like GFTN has). To me, they didn't seem like a good candidate for a GFTN replacement, but that's just me looking at ingredients and thinking "not enough good oils, probably not moisturizing enough".
CG since 11/2011
2c /3a F /Mii, low porosity

Summer Products /Routine:
Clarifying: ACV rinses, Suave Professional Men Deep Clean Peppermint
Low Poo: Renpure Luxurious Argan Oil
Co-washes: VO5 Kiwi Lime Squeeze or Strawberries & Cream
RO: VO5 KLS or S&C, Cure Care
LI (if needed): VO5 S&C, VO5 SC, Cure Care
Stylers: FSG, AIF,
Tresemme Flawless Curls Bouncy Curls gel
PT: IAGirl's (link) as needed