If you look at my profile, I only play Endymion and I've reached M1/D1 with Endymion several times. I don't ever spend gems and use UR points to craft meta decks or the new popular stuff so it's kinda hard for me to say whether you should use your gems to build an Endymion list or save your gems for future stuff. Only time I do, is if there is an engine that's usable in Endymion (which there isn't much).

I will say this, if you're a dedicated enthusiast like me, someone who is willing to accept and deal with the shortcomings/weaknesses of the deck, who is willing to take L's because of maxx c/droll/sacky BS, and who is willing to fully understand the deck and know how to pilot it in every match ups then yes I'd absolutely personally recommend this deck. However, if you like investing and rolling on new decks/archetypes and if you have such a hatred for Maxx c and you absolutely have to dedicate main deck space to stop the roach (which this deck cannot), then no I don't recommend this deck. That's the one advantage the other pend decks you've played have over Endymion, it can run maxx c and handtraps.