What are your thoughts about moving up product line(s) within a Company?

I like co.s that have been in business a long time and have good customer support.

e.g. Magneplanar, Vandersteen, Bryston, Audio Research and many others

I've had very nice components where the small, innovative co. was wiped out and then had trouble getting them repaired.

A vision pursued over decades, honing the SQ every several years counts too (see above)

I have moved up the line with Thiel loudspeakers starting with the SCS 4, then 1.7, then 2.7 speakers. I could definitely hear good improvements everytime I moved up the line. The more expensive speaker always had sweeter and more refined highs, as well as punchier and more extended bottom end. 

If I could afford too I would. but I cant so I dont. So there!

Once I find a company where I love their philosophical approach, reliability, customer service, and most importantly "signature sound" meaning what they value most in reproduction - then I am inclined to up the chain for me that has been loudspeakers Von Schweikert, amps Nuforce/NuPrime and source Ayon

Once I find a company where I love their philosophical approach, reliability, customer service, and most importantly "signature sound" meaning what they value most in reproduction - then I am inclined to up the chain for me that has been loudspeakers....

+1!

In my case I upgraded from Golden Ear Triton One to Golden Ear Triton Reference speakers.