Is OPPO worth the inflated price?

Not to me. I paid about $100 more for my 203 than they originally sold for, but 3-4 times? No way. 

I wouldn't worry too much about the warranty, I have not heard of any widespread issues and I've owned 5 Oppo units and all worked flawlessly.  I just don't think they are worth 3-4 times what their retail price was, that's just stupid.

My BDP103 sounded better played through my Auralic Vega DAC than the BDP105D played straight to my preamp.  I have also owned a Modwright modded BDP-95 an Oppo HA1 headphone amp and now have a UDP203 that replaced the BDP103.  I don't think I've heard the 205, but find it hard to imagine that it sounds substantially better than the HA1 (which had the best DAC of the Oppos that I have heard) or BDP105/105D.

The thing I liked most about the Oppos was the streaming apps that came with them and when the UDP series came out without the apps I lost interest.  I did break down and buy a UPD203 at a slightly inflated price so that I could have 4K when I upgraded my TV, but I don't use it for music at all really and have a BlueSound Node 2 for Tidal/Spotify/Qobuz/etc. and Roku for Netflix.  The only thing I use the UDP203 for is Blu-Rays and 4K movies.

My Marantz KI-Pearl takes care of the little silver music discs and blows the Oppo away.