I would. It'll help you and won't affect you if you decide not to use it in PVP.
Yeah, summoning doesn't affect you on a pvp world.. but it does on a regular world, if you would want to go to a duel arena, you wouldn't fight your own levels, and the levels you then would have to fight would beat you. Idk, no matter what the "advantage" summoning has, I NEVER gotten it on any of my accounts, it just ruins combat levels. You will see, you will reget it later.

