I wish I could answer that. I have not tried reta yet. I started stacking survo with tirz for the reta-like effect however I read many times about increased BP on reta which, due to underlying cardiac conditions, I wanted to avoid by being able to control the dosage to the 3rd receptor. I, of course, had no idea if that would actually work so I started small and increased over time to 1.8 of surv. I'm pleased to report that I have experienced no increase in BP at all. YMMV.
I would not have been comfortable with reta for this reason alone.
That said - I do have a vial of R10 and now - after 3 months of stacking T and S with success - have been contemplating actually trying the reta to see how it compares. I would not stack this which is why i am still not committing to it because - in my mind - for a true comparison I would have to have a washout of T and S first and that would take weeks and I am on a really comfortable auto-glide rhythm currently.