Is the Modwright for an Oppo udp205 worth it?

There’s nothing you can achieve with a mod that you cannot achieve with a separate DAC which you can run straight from your Oppo. Probably less expensively, better SQ and with way more choices and flexibility. For the price of the mod you can get a great DAC. That system will also hold its resale value a lot better. You can get a DAC with tubes if you wish, but best place for tubes IMO is at preamp or receiver level.

@unsound 

Yes, perhaps so.  But only if you ignore what IMO is the ultimate futility of building up an expensive disk based system.

Ripping CDs and SACDs is what everyone will eventually turn to for great convenience and better SQ.  Not to mention downloaded files and streaming. Getting a fine external DAC and hooking it up to an Oppo is a great first step.

Different strokes!