I agree 100% about everything.
I would just add that even if I did not try this for many many days, I haven't found any stock Helix cab/mix combi that can get me the same satisfactory tone (and effective for live & loud use) that I can get from some selected IR files sold by the most known suppliers.
Among the best, apart from Ownhammer, I also got excellent results with Cabir.eu (I love their Orange 4x12), and Valhallir.at (Wolverine 2x12 is really great). By the way, Valhallir offers also some very good free samples that could be enough (adding maybe some extreme - as usual with Helix such as 80Hz/4.5kHz - hi/lo-cuts in the Helix).
I also generally prefer the customized and ready mixed versions of these IR files.
From 3Sigma I bought only one pack (UK Custom) but for me it's useless (too mid-scooped), so I did not try anything else from them; maybe they are ok if your target is just recording, headphones and low volume use.