I agree that it's not perfect, and that it is still evolving with potential. You get 30 mins free just for joining, and an added 4 hours extra through Reallusion. I had no issues installing the plugin and Replica software.
There isn't really a learning curve, watch the RL video and scroll through the help notices on the site to get up and running quickly. They're still building their voice collection, and while I find that quite a lot of the available voices are more suited for gaming environment some can be applied to "normal" dialog with a little tweaking.
It has the great advantage, IMHO, of adding the voice, text and visemes directly in iClone for instant preview and use.
Gerry
System: Win 10 Pro (21H2), Asus X99-E WS, CPU i7-5930K -3,5 GHz, 32 GB DDR4 2666-16 RAM, NVidia GTX 1080 Ti GPU - 11 GB VRAM(Driver Studio-536.99), Samsung 850 Pro 512 GB SSD, 6 TB HD storage.