Can say I'm a huge fan of unbiased realistic render engines but they offer an additional aspect. Reality using Luxrender was the first. Fairly cheap and with an uncomplicated menu system. Nonetheless the materials and lighting were difficult to master because it took too long to get a lighting check image to adjust these. In the large sizes I do, it was taking an overnight or even all day run to get a decent image.
Octane was much better but pricey at around $350 including the Daz Studio plugin. Using the more powerful graphics card to render it was faster to get feedback. If you did get Octane then the Redspec shader for good skin at redspec-sss.com/ were well worth having.
When Daz Studio introduced Iray in version 4.8 it made the purpose of Reality and Octane redundant. Here we have a program which is both free and with much better vendor support. As it also uses the (nvidia only) graphics card its fast too.
Now the latest version of Reality, 4.1 has some excellent shaders so that Daz Studio and even Iray materials are translated easily. Nonetheless its no easier to use than Iray, looks as good but no better and takes 2 to 3 times as long for an equivalent image. I suppose if you have a powerful CPU but weak graphics card or an AMD graphics card it could make sense but I can't see it having much of a future especially when Poser gets its realistic renderer too.
Speaking of Poser I'm not going to bother updating that. I started this hobby in 2008 and I managed to pick up a cheap copy in case I bought something which really was not useable in Daz Studio. (The vendors are Renderosity typically said 'Not tested in Daz Studio' - Thanks really useful). I quite liked Poser but I can't realistically translate my contents library to be used by Poser. From 2008 to 2015 Daz Studio has advanced hugely and Poser very little.