Doesn't look any more high maintenance than VPP or DW-Link. It says that the infinity link service interval is 40 hours, hitting it with the grease gun (those two silver grease ports). Those intervals tend to be conservative, to address those riding in more extreme conditions; they note that it shouldn't be lubed more frequently than that. They also increased the warranty to 5 years and said that the link passed a test involving 1 million cycles immersed in a mud slurry.
People comparing it to Magic Link or think that the link is an additional damper are probably mistaken. It's really not that complex. It's a single pivot setup that has the main pivot on a rail. There's 2, because they opted for round rails for durability (available parts they know work in the long run), to allow for a large thru-axle type pivot, and because only one of them would make the frame more susceptible to "tail wag" flex. It looks beefy to me. I want to see the wheel path plotted out that this system creates, perhaps compared to Maestro's...
All the ride reviews so far are gushing, with one of the more common comments stating that it gives so much more confidence that it will have you outriding its 5" of travel, and its handling making you feel like it has more. They also state that it climbs with amazing traction and can be left in descend mode except for riding on pavement.
I like VitalMTB's report on the bike. <a class="postlink" href="http://www.vitalmtb.com/features/First-Look-2015-Yeti-SB5c-with-Switch-Infinity-Technology,755" onclick="window.open(this.href);return false;">http://www.vitalmtb.com/features/First- ... nology,755</a>