I have spent time with Arp Dimensions and Guitar Mutations. Arp Dimensions is very good and as someone who likes electronic music driven by arps, these sounds are perfect for that so yes they are good and sound great too so production is often minimal. There are tons of patches and once you start combining mix pads there are limitless variations.
I have listened to the Guitar Mutations demo a few times and that one sounds interesting. I get the impression the guitars can be very straight and normal sounding but also very ethereal and wild and complex soundscape sounding as well as interesting rhythmically. Guitar Mutations is in the top sellers for them right now so that says something. I can see why for sure. I have auditioned it a bit and Mutations is certainly the buzz word there. You can turn delays and arps off with quite a few of the guitar patches and you will get back to more real or normal sounding single note guitars etc but it is the interesting sounds and rhythms they are creating using guitars as the raw materials that is more interesting for me. I find Alchemy patches inspiring across the board anyway.
I am working with a female singer/songwriter producing four songs with her right now. I am going to try and work some of the guitars into her music and in a much straight way. I will report later as to how well that goes. After more auditioning of Guitar Mutations I am finding there will be places within her music even for some of the more complex patches.
It is good to alter the amount of effects processing that is being added within Alchemy and add your own more subtle effects later. Often I also like the effects very much that are programmed in and leave them well alone.
I believe the instrument has a great sound and can be produced and mixed into any situation very well and comfortably. I am a bit of a fan as you can tell. I have got some great hardware as
Tony S mentions I have a lot of Kurzweil power (3) and it sounds amazing. Often blows away an average VST instrument. Things have to sound pretty good to be in the hardware Kurzweil and Emulator, Roland JD800 class. But Alchemy is in the class with its fat sound, lovely bottom end and just great overall sound. I don't get Alchemy to do everything, there are a lot of other things assisting it in what it does. It blends and works so well with everything else for me here.
There is also a good reason to build up complex pieces just using multiple instances of Alchemy. I get the impression it would kill doing that like the hardware does so well and easily.