At first you have to know I'm not guitar player and well I'm not even a musician. I can't and I will not compare it with real guitar but I will rather treat it as virtual instrument since well - it is a virtual instrument.
Sound is very important but UI, workflow, performance and stability is important too. I do enjoy sound design but from sampler I mostly expect usable sound without spending too much time to tweak the instrument. With H7S you can have that but of course you can tweak it to your liking. Versatile and very usable not just for heavy riffs but also for clean sound. Fast loading and better performance compared for example to some similar guitar libraries in kontakt and very stable (for me FLStudio 12.5 64-bit no single issue during testing). Clean and resizable UI that is easy to navigate. Awesome sound and many usable features.
My first e guitar was Shreddage 2 SRP which is nice but it was more suited for heavy stuff so I have added and Evolution Dracus to my arsenal for more clean sound. Both libraries are good and usable but ... Now I have also added H7S to my instruments pool and it will become my main tool for electric guitar sound. It may be more expensive but better sounding, more versatile and it come it very good effect rack that can be used separately. So at the end it is cheaper.
During my first test with H7S I made short and simple track using 3 slightly modified factory presets - instances. One instance for clean, one for rhythm and one for lead/solo accompanied with strings, brass section and some orchestral drums ensemble in middle for some hybrid music experience. It is not best showcase but it was made right after my first use of this instrument. That's really show how easy is to use this beast.
I tend to disagree a little bit. When rating an instrument I think all things in the instrument should be considdered. HS is pretty good when playing the keyboard, especially for things like heavy (hence the name) and metal. However there are a lot of guitar instruments that are in that respect. When it comes to other features IMHO others excell. HS presets ranges from very quite to EXTREEMELY LOUD. Annoying. The enclosed presets are not to my liking and the "grooves" or "solos" are mostly unusable in a song (but can serve as an inspiration). If you are after a guitar software that you want to play the whole thing on your keyboard it is worth looking into, but the guitars from Ample Sound, Music Lab (Real Strat/LesPaul/8), Impact Soundworks (Shreddage) etc should also be considdered, especially when combined with a good amp/FX simulator (like S-Gear or similar). If you are looking for a software that kind of helps you as a non guitar player and not so skilled at the keyboard, the other three mentioned are better choices.