Well, if someone who owns a Helix hasn`t dumped the thing after a day it says a lot ............
I always thought that they ought to have given the V a different name (Firehawk Jr or even a name that sounds a bit like Helix) , there`s way too much (mostly deserved) past stigma attached to the Spider name . When I demo'd the amp to a mate who`d not seen the V , I covered the maker and name up with black tape , told him it was an amp made by Yamaha (which it is) and demo'd it from my own patches .. his reaction was "Wow , modelling amps have come along some haven`t they, that kills my VT120+ stone dead" .......... I uncovered the names and the response was "No way" ...... people hear with their eyes and even if Line-6 had put presets in which do more than sell other makers amps , the Spider name would put them off ...
as you say presets are variable in all modellers, even the VT100X which doesn`t really have presets but starting points - but the Spider V seems to have won the highest number of duds award by miles .
I tried the Katanas a while back and found them, while good, are too limiting and quite frankly well overrated sonically I think a couple pedals and a scruffy Peavey bandit would replace and dare say BETTER the 100 Watt one easily at a fraction of the price, they`re that kind of amp . YMMV of course .