Have Luxman 509x. Considering Pass Labs INT-250 or Dan D’Agostino Progression Integrated

Also, how does the L-509X compare to the 507Z and 509Z?

Ryder,  yes 590axii is terrific integrated - if your speakers are not demanding a lot of power. In some cases I felt that bass is a little shy and missing some articulation. When 507z came out, my dealer sent me well burned unit. Again the key to luxman integrates - especially latest z series is sufficient burn (at lest 300-400 hours). The 507z had deeper, more resolving bass in compare to 590. This I expected, but what surprised me is how 507z presents overall sound - more liquidity, blacker backgrounds. It’s also more resolving. I guess new technology contributes to all that. This Thursday 509z should be delivered. I did not hear it before pushing the bottom, but regardless - it should be a keeper for a long time. Even with 507z I feel like I can leave with it and just enjoy the music. Of cause all is ear and system depended. 

@denon1 , thanks for the post. As an L-590AX owner, your comments are interesting.

Thanks Denon1. I would be looking forward to your experience with the 509z.

I will have to burn 509z for many hours. The mistake of some owners (I was there too many times) to make conclusions before sufficient burn. It costed me a lot of money to ignore burn in significance, system synergy, isolation and room acoustics.