I love the 5050 power amp, FWIW. It is pretty amazing and is a great amp for the modules; adds just a touch of power amp flavor without being overbearing in its response across the entire frequency spectrum, a touch of compression and sag as you turn up for that tubey response... Love having the depth and presence controls right there, they are voiced really well and are great to make high and low end adjustments based on volume level and the room being played...
For me it was totally worth it to go full synergy
, the form factor is great and I would guess that it is used as a reference amp during testing/design of the modules (for example look at the Metroplex test vid on YouTube) because it seems to go well with all the ones I have tried so far... It is very similar to the Fryette LXII and others but voiced to Synergy’s requirements...
That said, if you are willing to look at 2U or larger units, there are MANY great rack power amps to pick from, so listen to some demos or check a few out and pick what sounds best to you or has the features you want. Some folks even use light SS power amps like the Duncan power stage.
And of course there is the head... I already had a rack setup so I wanted to stay in that format. If I didn’t feel the need for rack stuff the head seems like a great option and is cheaper overall than the Syn2+power amp, so if you are using pedals or something for FX instead of rack gear it might be the best option of all!
Good luck.