Which DAC makers let you do in home trial?

Thanks @yakbob That's a really intriguing idea, especially the configurability. I'll try to see if there are reviews, at least!

Mojo audio R2R dacs a bit more money 45 day evaluation

Thanks. Weird that a popular DAC is called Chord Mojo and Mojo is also a different company's name all it's own. But good to know. Thank you.

Mojo Audio gives you a 45 day,money back guarantee,5 yr warranty.
theyuse only the classic ladder dac R2R  Loaded with parts you 
normally only see in $$ modded units ,such as Vishay naked resistors , worlds best Belleson voltage regulators 9 of them 
Analog devises dac eith multiple transformer or transformer and 
250;000 ufof capacitor filtering ,lab grade input filtering .Sparkos Descreet opamps whichare a Night and day better then any opamps and $$.  Lowest noise = sonic purity and parts quality counts.i have had equipment upgraded for years .my speakers I di myself but digital like  Mojo Audio you Wil have to spend many times to = or better their performance .their Mystique3 is great if you have $
over $5 k to spend. They also assist if upgrading netcsrds,and usb audio ,and in your pc they sell regulators plugin that eliminates all the crap in switching,and I have their linesr power supply the best one I have heard period .their dacs also gave 
dual Femto clocks , I bought their a Mystique Mx 2 with the latest Xmos board , it sounds in my setup more natural then the Schiit Yggsdasul and similar pricedwit

Thanks for the detailed descriptions!