Here is a dump of (almost) everything I've made using easyfluff+hll6.3 so far
https://catbox.moe/c/74ogn0
It's obviously a huge jump in quality from NAIv1 based checkpoints, here are downsides I've observed:
It's very high quality, to the point where it kind of looks like actual art, lots of images might seem to be missing a lot off telltale signs of AI art such as high contrast. Might just be due to being based on furry art from the start, but it seems "realer". This means that if you have a particular fondness for how the style of your favorite NAIv1 based checkpoint is, it WILL take some getting used to. I for one really liked my custom based mix and I do miss it
It's really hard to get the usual nearly-#FFFFFF skintone that is common in anime. I literally can't do it, weighting pale skin very high gets you close but then the skin is also very saturated
Most of your results will look like they need a contrast boost, with some exceptions depending on which artist style you're prompting for. The image filters extension works for this and I basically permanently have it on in img2img with just a +1 boost for when I upscale my base images x2, you might also need a color boost
Your mileage with style loras (trained on fluffyrock) will vary, probably a lot. Probably owing to the training model being primarily focused on furry art, style loras are dampened and maybe this can be offset by higher learning rates but I can tell you it's not really offset by adding more epochs
Both character and style loras are dampened by hll itself. This is also true for styles when it comes to the NAI version of hll. Do note that adding any of the quality tags like masterpiece and such will force soft shading into the image, you might have to play around with the intensity of 'lineart' 'flat colors' 'masterpiece' 'best quality' and 'digital media (artwork)' to get a style more accurate to a given artist or character
Concept loras are even more of a mixed bag, my main experience is with clothing but it might seem that they aren't even on with some gens. Character clothing in character loras are also affected
Easyfluff (with hll at least) seems to have a habit of only generating an upper body image unless you explicitly tag something that isn't on the upper body. i.e even 'pubic hair' isn't enough, you have to add 'pussy' as well to get that in the frame sometimes.
Due to conflicts between what furfags thing are big titties and what animefags think are big titties, you might find breast size 'swinging' between gens
Easyfluff (with hll at least) seems to have a very very hard time making it so the character you prompt or use a lora for is the 'doer'. Even with controlnet, I rarely got a gen that properly depicted a taker pov of getting fucked by the character. Without controlnet, the character was always the one getting fucked no matter who had the dick. This might not be an issue with yuri but I don't prompt yuri
The easyfluff+hll combination has very high highs, but lower lows than the folded 1 trillion times NAI mixes. While modern NAiv1 mixes basically generate a usable image every time and it's about that search for the best one, you'll run into quite a few gens that just have broken or phantom limbs, hands in the completely wrong orientation, etc. I feel like this is a symptom of hll and easyfluff clashing since they are wildly different
This is like 80% of the way there, and has fully convinced me that we really do just need someone to make a truly modern anime model. SD 1.5 can still do so much good.