I love the tone of the Furthrrr Generator. I use it all the time and would buy it again in a heartbeat. For whatever reason, though, I struggle with the E352. I bought it mostly for drones and textures, but it sounds so much different than everything else in my rack that I have a hard time fitting it in to what I do. I'm not an analog purist by any means, but that thing has a very clean/digital sound. It's so dynamic and every setting seems to fill the entire audio spectrum, so I've found it hard to layer things over top of it. I likely need to EQ it better. I use the FM and morph settings a lot more than the cloud settings. I'm not sure that I would buy it again, but I'm not in any hurry to get rid of it. I think I just need to spend more time with it. It's pretty deep.
Have fun with your new rack!