Pass X1??

I am using a Pass X1/X250 combo with nice results but am wondering if the x1 is one of those preamps to hang onto or is it so far obsolete that it could be easily beaten with a less expensive new preamp. My X1 sounds fine but have there been advances in preamps that make the X1 obsolete or is it a piece to hang onto for a long time. Mine is sounding good but as it is now the oldest component in my system I thought I'd ask. I recently got new digital which is indescribably better than I was used to and the digital I was used to was pretty good. I'm thinking the x1 may be a keeper because of it's simplistic design. I think if something goes wrong with the X1 that it will come across as obvious and not just degraded sound. I would consider the XP-10 but it does not have a tape out which is essential for my headamp. The X20 is simply far beyond reality due to price point. I guess my question more to the point is that if I sell my X1 for $2000 then what would far better it at the $2000 price point? I'm still thinking the X1 may be a keeper. It will require replaced chips as they are bound to go throughout the years but this is normal.