Yep! Very frustrating. Especially because I LOVE the set-up.
I bought a
(used
) 2012 Felt B12 with Vision Metron Shifters about 3 years ago.
Personally, I think the Vision Metron shifters feel much more comfortable and convenient vs. "traditional" shifters...perhaps because that's all I ever knew since I was a newbie a few years ago and this is my first tri bike. But it feels like a poor man's version of electric shifters almost, because you push a button or pull a finger without having to move your hands much at all.
That said, I quickly noticed that both shifters seemed to stick and/or skip at times. Not all the time, but often enough that it's frustrating. Sometimes it would take 2-3 attempts to go from the small to big cog. I've had the bike serviced at the LBS multiple times to see if they could get 'em dialed in, and it did seem to get slightly better.
In fact, I liked the setup so much that even opted to swap them out with the "traditional" shifters, when I bought another bike
(Cervelo P3... where the shifting felt so much more sturdy and consistently reliable, but were also incredibly uncomfortable feeling... felt like I had to hook my arms around and my elbows came off the pads which felt less safe
). That may have been a mistake.
The LBS suggested it may be close to completely failing when I did that and was having problems. They weren't much help in addressing the lagging/skipping. I had another bike mechanic take a look at it and he got it really dialed in right before IMMD. It only lagged in a few middle gears occasionally.
BUT...the rear shifter just froze completely solid while I was on the bike trainer the other night. And then the housing popped off without much force, which is a new thing that I've never seen happen before.
Very odd.
Regardless, guess that why they don't make these shifters any more!!!