Covert Tank is early to roll and doesn't seem to cover many boards from front to back. In my opinion, the core is too strong for the cover. If you take the cover to a lower(more aggressive) surface, then it just loses energy too fast. I suppose of you have higher ball speed and major rotation, then it might work okay, but otherwise, it's below average. It would probably be useful in controlling a short and heavy flat pattern(for me).

The Supra is about as opposite of a reaction as you can get. It seems to slide forever down lane, then makes a sudden turn across the lane. I find the ball to be excellent as the track on a THS drys out some and I need to move deeper. It's a great ball for bouncing off the burn and gets back with very good energy to the target. If you are looking at carry down along with a burn area, this wouldn't be a good choice. If you have a lot of oil, or even medium-heavy oil, this isn't the ball in my opinion. Even if you have the hand to make the ball read the break point, it's more than likely going to put you in over-under hell.

So, to sum it up;
Covert - Early rolling, sluggish down lane with not a lot of movement.
Supra - Slides a long way, then makes a sudden turn with good energy at the end if the conditions are favorable for what the ball is designed to do.

I pretty much agree with the above comments.  I use my covert tank as a spare ball, if you have no hand or high ball speed then I believe there are better choices especially if you are not good at changing hand positions.  I bowl on a higher volume house shot and with a stronger hand position the tank is too much on top of the friction but going left really isn’t an option due the above comments on the core/cover combo.  Going more end over end allows me to play the friction but I see a huge decrease in carry.  I have used it on a short sport shot where the gutter was in play and it was amazing mostly because I was able to control the ball down lane.  I do agree the core and cover seem to fight each other and getting aggressive on the surface makes it so early that it quits down lane.

Don't sleep on the Hydra with its Hexion cover stock and light bulb core.  I personally think its the most versatile and the best of the three.  Great transition step down ball for me.

Thanks guys! The Hydra seems like the better step down ball for late ths league. Supra may be too much and covert tank too early and not great from deep. Really interested to see what motiv adds next. Their only hole on the website is between the Hydra and the thrill.

I have an old rebel tank. Love that ball for awful lanes. Same core as Hydra.

Quick video, long version with many more shots will get uploaded tonight.

House shot and surface makes them all look pretty much the same to me within a few boards of each other.  Video them on a 6:1 then  you might see more separation with OOB designed surface.

What's your step down ball from the Supra?1