from ARC to Pass ?

My friend went from same ARC pre to Pass X2 then Pass XP-10, with significant improvement each time...amp was Pass X250.5

so, first answer is:
Pass X2 better than ARC LS25/II (in the opinion of jl35's friend, it's understood).
ok, thanks.
I've read many comments about the X150.5 power amp, and they all told about a very good amp, but I did not find comparisons with my venerable 100.2.
on the other hand, I've found very few comments on Pass X2, with my surprise: a lot of comments on X1, X2.5 and others, but few on X2, so I really don't have the faintest idea about what to expect.

question: so, daniele, why are you thinking of that combo if you don't really know about it ?
answer: I've always been attracted by Pass products, I always thought I would try some soon or later, and I've found that combo at what seems an honest price to me :)

since neither Pass model is current, you should get a good price, and Pass tends to be an easy resale if you don't like it...   the Pass was much better in my opinion also, in a system I was very familiar with...in fact my friend purchased the ARC from me