Well, all I can state is that I have extracted about 60+ titles using XISO and have had absolutely no problems. I have not used XISO to reconstruct ISOs, I use GDFImage for that.
I guess everyone has different experiences. For example:
I have had no problems extracting with XISO on tons of ISOs, others have.
I have had no problems with MenuX with over 40 burns, others have.
I have had no problems with Cheap media and using ISOs, others have.
I have had no problems with the Matrix, others have had crap loads.
Wow, maybe I am just special.... at least that is what my mother told me when I was young.
I guess there is really no solid answer to all of these things... alot are preference and different experiences. Once i find something that works, I typically stay with it although you did convert me from UDF to ISOs, especially after I saw the load time difference on Burnout. Many others don't show much improvement but does seem to keep the thrashing down.
Anyway, I don't think either of us are wrong.... it seems that based on hardware, software versions, etc... many people have slightly different experiences. All I can post is my experience and what has worked for me.
I guess I am the horse that isn't drinking the water again.