I`m using a Flyknit racer at the moment (along with various other shoes). Not sure how different it is from the trainer.
The racer is very light (7.5 UK weighs 170g). Cushioning is good. Not as good as a Lunaracer, but still very good. I could (and probably will) run a marathon in them. Fit is glove like and comfortable. Grip is amazingly good on wet or leafy road/moderate trail. Rather better than my Hoka Rapanui trail/road shoes. Don`t handle slippery mud. Don`t know about longvevitry - suspect not great but certainly not awful. Main downside: price.
I've used a selection of Garmins including the 301, 305, 310, 210 and 610 (and the FR50 and 60). I`ve also dabbled with devices from Nike and Polar. For my money, the Garmin 610 is a very good running watch indeed.
Don't get me wrong, the device and indeed the company, are not perfect. I've had a fair amount of trouble with the strap (wrist strap securing pins kept popping out). When I raised this with various Garmin representatives they swore, hand on heart, that they had never heard of the problem. This, frankly, was a lie - one only has to Google the problem to see that it is, or certainly was, widespread.
Their mendacity encouraged me to look elsewhere. I had a good look at the Suunto Ambit range. Whilst undoubtedly powerful (and very expensive) bits of kit, the informed consensus seemed to be that they made for better trail running watches. They had certain obvious defects such as the lack of the vibration alarm and the inability of the foot pods to cut in when satellite signal was lost. Interval functionality was also apparently limited. Have a look at DC Rainmaker`s comprehensive reviews on all watches, including the Ambits. Also, on the subject of customer service, Suunto caused enormous anger when they replaced the Ambit 1 series with Ambit 2 series. Suunto had previously indicated they would provide updates and software patches for the Ambit 1 for the foreseeable future. That all went out the window with the sudden and surpise intro of the Ambit 2. Lots of people who had just spent £350 on an Ambit 1 - assuming it was future proof got rather cross when the Ambit 2 popped up and support was pulled for the Ambit 1 (I think some kind of partial compromise may have been eventually reached). I guess the message is that for most of these big companies profit is king and the customer can go screw once he's handed over his/her hard earned cash.
Having had a good look around, I have slightly reluctantly returned to the Garmin fold. Customer service does indeed suck but the device is a very good one. It is certainly the best running watch that I have used.It works, and it works well. It is generally reliable. It is accurate. It picks up signal quickly and retains it well.I've even managed to sort the strap issue out with the simple expedient of superglue.I've had mine for about 2 years and were it to break down tomorrow I would almost certainly by another one.
I've heard that some people have had battery/recharging issues. All I can say is that I have not experienced that particular problem. The one thing I would say about the battery is that after the equivalent of 3 or 4 hours of running it does need recharging. Battery life on the 310 is much better.
I suppose what`s particularly interesting about the Marine Corp tests was the scale of it. As far as I can tell (I may be wrong on this) no previous study could begin to compare. Furthermore, I suppose the fact that it appeared in both the AJSM and its British equivalent might also indicate that the underlying methodology was sound.
If the results are valid they do seem to undermine the whole gait analysis industry.
I must say I think the 30 day trial period is fair and sensible. But if the MC Test results are correct, one might as well just sell shoes on the basis of perceived comfort.