Is It Worh Modding An Amp

I have a Primaluna Dialogue One that sits idle as a backup.  I’m debating the idea of having it modded. Problem is I have no idea what can or should be upgraded or if the amp is worth the investment. Id be willing to fork over 500-1000 if it was worth it and made sense compared to what else I could do with the funds.  Curious what people’s experiences and thoughts are?