got my 3rd class (TR) to lv30 yesterday

I'm wondering is it worth to get his class gem or its more worse if I use a class gem on him?

current pr for TR being 8.5k my gems for him are only at lv5 didn't even equip the last fire gem.

It's a easy 13k+ once I start to lv up gems on him cuz as a tank gem stats are easier to get 

any of your thoughts? I would like to know guys

The TR class gem is a direct upgrade over the already good ability that is Banshee's Boon. Ghost mode is shortened by 0.66... seconds as there is a summon cost for the Banshee of 20 energy but this is the only downside. All the abilities that ghost mode provided before as still present so you lose nothing.

Now once you see what the Banshee does it will become your best friend almost instantly. It will heal all minions around the it (think ghost mode healing) and follows the same pathfinding as them so it is always close by. The amount healed is also more than they lose so you never have to worry about minion health ever again. It will also attack along with other minions so even more damage for you at no cost (not a lot of damage but it is there). Finally it stays alive for 16 seconds on a single summon and whenever you use Banshee's Boon it gets resummoned. This means you can easily have it up 100% of the time without even trying.

It plays the class for you. Throw minions out, summon Banshee, summon Goliath when needed, repeat. I have completed ST arenas without ever touching M1 while always having 6 minions out.