Straighter Holes: Because this ring bit system doesn’t use any eccentric parts, it will drill in any type of overburden with pratically no deviation. The driver bit design has a pilot portion that drills 3″ to 5″, ahead of the  crown bit, allowing it to keep the casing very straight. If you try to drill on the side of a boulder with an eccentric system, the reamer will kick you out of your trajectory.
Better Rate of Penetration: there are two (2) distinct advantages when drilling with the Xs drill system:
1 – Concentric: On the crown bit, there are carbide buttons all around the periphery of the hole, as opposed to approximately one third (1/3) on an eccentric system. That means that for each turn you do with our ring bit, you have in fact drilled a deeper portion of the hole compared to drilling with any eccentric design.
2 – Hammer: If you have a lot of boulders, or if you need to drill in fractured rock, the Xs is the only system offering the advantage of using a larger hammer to drill with the crown. The penetration rate through boulders will be comparable to drilling with a conventional oversized bit. 
Smooth Drilling: Compared to an eccentric method, drilling with the full face Xs drill system will be an unbelievable experience. Working with an eccentric system is very hard on every piece of equipment due to excessive torque applied by the reamer on the driver device, hammer, drill rods, rotation head and mast. 
Wear on gage carbide button: The wear on the carbide buttons on an eccentric system (on the pilot and especially on the reamer part) will occur very fast, especially in abrasive rock or harder ground conditions. On the Xs drill system, there is double the quantity of carbides on the gage row that are actually needed to give extended life. 
Components: Eccentric systems consist of a lot of different components, all necessary for its operation. Usually there is a pilot bit, a reamer bit, a driver, steel balls, set screws, pins, spring pins, etc… if you are using a wing type system, a driver device, 2, 3, or 4 wings, pins, screws, spring pins, etc.. All these parts are very costly and this can cause you lot of time on a job site. With the Xs drill system, there is a driver and an assembled crown ready to drill. That’s it ! 
Toughness of parts: In eccentric and/or wing bit systems, all components are very fragile, and as soon as you have a little bit of wear in overall system, those parts are inclined to break without notice and leave you again with down time. 
Direct Energy Transfer: With the Xs drill system, the energy given by the hammer is transfer directly and entirely to the drilling part of the crown bit, and not to a driving shoe.
Easier to Weld: The crown bit is composed of two (2) assembled swivel parts. The lower rotating part which has carbide buttons to drill, receives the impact and rotation from the hammer. The upper part is welded to the casing, but doesn’t receive any percussion directly from the hammer but is pulled down with the casing through a swivel joint. The impact to the joint is minimized because the drilling action of the rotating crown portion has absorbed most of it, leaving however enough energy to pull down the casing.
Less Maintenance: In almost any other system, there is a lot of maintenance to do on the most expensive part which is the driver device. The driving shoe is fixed to the casing and the driver rotates and impacts on the upper shoe causing rapid wear to appear on the driver which then needs to be rebuilt or replaced. On the Xs drill system, that grinding effect is transferred to the swivel joint between the upper and lower part of the crown, which in 90% of cases is left in the hole.

Experience the difference with the Xs drill system