I've got both - so far I've had mixed results with Luxus but it's still early days and I'm assuming there will be updates to it down the road.

The quick summary as at the time of writing is that I'll be using Reality 2.5 for my "proper" renders, and I'll be using Luxus to create & save shader presets that will work in Luxrender.

Right now, Reality 2.5 is still head & shoulders above for consistantly high quality results, but I have been using it for a while now and can relate well to photographic/real life references.  I know that Luxus will be able to achieve the same results but it will require a lot of learning e.g. you can adjust a glass refraction to anything you want, but you'll need to know the index of refraction so you can enter the correct setting for each liquid/glass you want it to be.

I was disappointed that my Reality light sets didn't work via Luxus the way i hoped they would...  I assumed they would be fine once the scene sent to Luxrender, but were not recognised as mesh lights (had to convert to light like any other primitive, making them less efficient).  Maybe it's just that I don't know the right setting yet, but just commenting on my first impressions.

The big plus point for Luxus is that it will let you save shader presets, so you can set up a setting for Luxrender that would be easily reuseable on any prop/character and not be tied to the one you originally did it for (the same way you can apply shaders for 3Delight).  I haven't yet tried to render Luxus shader preset via Reality, but if that was to work, it would prove a valuable asset indeed.

Finally, I've never had any reliability issues rendering via the Reality plug-in.  When doing some test renders via Luxus today, I experienced several unexpected stops and crashes.  I've no idea if it's teething problems or a total coincidence, or whether it's because rendering via Luxus takes up more computer resources than the same scene will use via Reality - http://www.daz3d.com/forums/viewthread/18550/P30/#274169

Please don't get me wrong, I'm not criticizing - but as things currently stand, there really needs to be quite a few updates to Luxus if it's to be as intuitive as Reality.  That said, there are people on the DAZ forum that say they could never get their heads around the Reality layout, so one man's meat may well be another man's poison after all.

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