BobF
Ability to save presets is a must ...
As mentioned, you can save presets within a project or save as for future recall. You just can't save multiple presets within a single sim.
I'm thinking out loud here, but ... does the world really need more sims & effects for guitar?
YES!!! The reason why I came up with these sims originally was
not for Cakewalk or for the membership program. They were for my own use because I was not satisfied with other amp sims, and I have ALL of them. So at least I certainly felt I needed more sims. I haven't used any of the other ones since creating my own.
Also, remember that the purpose of these sims is
not to provide the 4,228th emulation of a Marshall stack or Fender Twin. The object is to create what I call "idealized" amps that are the amp sounds I hear in my head, not the ones that come out of speakers. A lot of the comments on my sims have noticed the "sweet" sound and that's what I was trying to achieve. I've taken liberties with reality, for example, a couple of the amps emulate how the sound changes if you're playing in a room and moving around. I don't know of any existing amp sims that do that.
Give 'em a try
As to effects, here the object is not so much to create entirely new effects although there are some of those (the Anderton Collection has a synched Vibrato + Tremolo where you can change the depth of each independently, which I haven't seen before). The object to speed up workflow, especially for songwriters, so you can drag something in and have it just work. Sure, you can take the time to assemble your own custom combination of effects, and I'd encourage that. But if you're in the heat of creation, being able to drag and drop something that's optimized for a particular application is very useful.
As one example, think of what you'd put together for a lead guitar sound...maybe a noise gate, compressor, distortion, and delay...maybe a chorus, too. So if all of these are put together in a pedalboard for an instant lead sound, it will take you less time to tweak that than create the thing from scratch.