Yes, I' m quite familiar with the Merlin shoot-through system. I am on their Factory Staff and also their #1 dealer in the USA. The shoot-through system offers a great alternative to the cableguard systems---no cam lean from side-pull, less bushing wear, which means less maintenence. Everything lines up--sight, rest, arrow. Once you get used to NOT inducing offsetting torque to counteract the cableguard sidepull, bullet holes are immediate, and accuracy is enhanced because of the repeatability.
Merlin, Greenhorn, Alternative, Martin, Kudacek, and others have been producing shoot-throughs of some kind or another for some time now. All have their good and bad points, but all are far better than any cableguard system IMO. I shoot them exclusively, except on my hunting bow, and that only because it didn' t originally come with one and I didn' t bother to change it. I would have no problem shooting one for hunting either if the bow had over 7" of brace height.
Try one out, at least for Tournament work. You' ll be pleasantly surprised.

Good shooting, Pinwheel 12