What Sampler AI is actually good for? Can it do a texture in exact size like 2mx5m cover?

A couple month ago I tried to use Sampler AI  to do something I codn't find in texture libraries . A racing track curbs.  Got nothing  really useful unfortunately  , always wrong scale, never an exact size I ordered. Tried to turn actual photo  into material - Sampler did it  no better than old style crazy bump . Brighter pixels are  higher and that's all .         Tried it for  a grass edge , a bit better  but still quite bad . 

I very much would like to figure out what   kind of materials and in what cover scale  it is trained to work ? 

I see it works nice for small 1x1m  textures of artificial materials with man made  patterns .  Right?  

Would it be a better idea  to generate  an image of proper size  in Photoshop   or elsewhere  and bring  to Sampler  for image to material AI only?  It seems as two different process in Sampler anyway?

I also wonder can Sampler generates specifically  height/depth maps?  Like braided streams for terrains for example?  Looks like something not even physiclly  based simulation soft like Gaea  is able to do. Should I try Sampler for this?  

Or work on height/color  image pair from photogrammetry to fix  errors 

Are there any big  updates after this summer lately  ?