RME ADI-2 DAC FS is it "All That", especially for under $2,000?

Another happy user of RME ADI-2 DAC FS newest generation here. "End game" for me. Especially (important point) with balanced XLR cables (to my MF M6si integrated). For balanced connection make sure to adjust DAC's reference level to +1 (see a lot of discussion about the topic on the excellent RME user forum.) This DAC is now the heart of my system. It is getting optical digital input from Node 2i. Node 2i gets music from Qobuz/Tidal, and from USB attached WD Passport disk with all my CDs ripped to FLAC. The DAC is also getting digital input from my CD player over a Mogami coax cable.
The manual is a great source of information about digital audio, UI is learnable and for me now it is set it and forget it. I use a very nice remote control to select input (optical vs coaxial) and to adjust volume/balance. 
The sound is wonderfully detailed and noise free.  
Expensive interconnects are not needed, mine are Sommer Epilogue for about $100. They beat Audioquest Colorado RCA. No 3rd party power supplies needed either.
At this point I no longer consider any further upgrades to my system, I totally love what I have today -- and just concentrate on music (not equipment)

A new DAC with no I2S input ? I don’t get it. For headphones this DAC is killer...if you have a dedicated system with an amp / pre-amp already and don’t listen through headphones then you have better options. Look at the Topping D90 for example.  Give it a try and purchase from somewhere that allows 30-60 day returns...you have nothing to loose.  Congrats on the MOABs.  Let us know how they work out.

I am really enjoying the Topping D90. It improved every aspect of sound from my system.  I got it for 630 from Apos Audio who will let you return it but I would be very surprised if you did.  This has the AKM 4499 with other high quality components.  Denafrips uses the R2R topology but is 8-10 wks out.  The Sabaj D5 for 469 uses the latest ESS chip and also got very good write ups.  Gustard A22 uses two AKM4499.  After that the price goes up and I don't know what configuration the other regarded brands use.  

I actually bought both the RME ADI-2  and a D90 just yesterday. I will try them in combination with my PS Audio pre and my Axiom II pre w/walker mod from my other system, and see what works best. I will also try the RME as DAC and preamp.

I have a 60 day return policy on the D90. I bought the RME from the manufacturer, forgot to inquire on their return policy, but unlikely I'll want to return it.

I do use XLR between components for 2 channel. I hook my HT Prepro main outputs to amp via RCA, and switch back and forth. Best of both worlds so to speak. 

Thanks @ghjuvanni. It will take a while to learn, but I am pretty good with electronics. All the DACs I have used have power and source select as only options...  :)