Tron is a very good tank. Wife vapes it in TC with nickel coils. She does coffee flavors so a coil lasts her two days which is not a problem as they are so easy to rebuild. Two things is every tank full or two I take coil out and wash bottom piece of tank because juice gets down their which effects its contact, I take a piece of paper towel and twirl the corner and stick it threw the coil and spin it around and clean the inside of the gunk. Then put it back together and refill. That will give you another round with same coil.
Their are two NI coils for the Ego One. The Ni.2 have a bigger airflow hole threw the middle than the NI.25. Make sure you have the .2 ones with the blue rings. I upsize the air hole down the middle when I rebuild the CL coils. Perhaps why I never minded the airflow and I like big airy tanks.
Can tell you I set a Tron-S up with nickel coil and a Cubis tank with same coil. Wicked them both with the same cotton and the Tron-S blew the Cubis right out of the water for flavor. Wife could not believe it was even the same juice in the two tanks.
Lots of good tanks out now. I personally think the Atlantis 2 is hard to beat. Coils last a long time and can be rebuilt very easily as well. Good assortment of coils can be bought for it if you do not rebuild. Price wise the Hercules Plus is a great tank. Much like the Atlantis 2 and does take Atlantis coils as well as the Hercules coils. Triton 2 would be along the same line but I do not own the version 2. Ask around about the Triton 2 because I have the original Triton and it will not even fire under 40 watts. It is a power sucker.
Save your coils and if you ever drive through Meaford (between Owen Sound and Collingwood) stop by the Vape Store and I can teach you to rebuild the coils in about an hour. You will leave a coil building pro. UTube is your friend also for learning to rebuild stock coils.
Hope this helps
CHEERS!