cannot fault the fit on them - i used the Energy Boost for my sub 3 Berlin run and i think they did help. They where a little lighter than the Ultraboost at around 270g but the fit around the top was always tight - in fact one pair destroyed my feet at Frankfurt through being too tight - but these Ultraboost with the Flyknit top makes a huge difference, they are light and airy, certainly do not notice the extra weight. Recently ran a 2.49 24 miler in training in them so they may help me to a PB. I cannot fault them.
Good luck to all flying out for Boston this week - particularly those crazies doing the Boston/London double - i did the reverse last year and the whilst i thought i had recovered from London that downhill first 3 miles destroyed my legs. Enjoy it - that finish is so full of emotion given recent events - i'll never forget it.
PhilPub - are you going to buy the Ultraboost at the expo then run the sunday? I have two pairs already and can say they ARE gods gift to running - in my first pair i did a 23 miler on only the third time wearing them with no trouble. My toenails are now breathing a sigh of relief - they are the answer to no more black toenails
Leigh - good luck at VLM you should get round if you are at 20 miles already . Went to a physio who said my tendon is strained but then so is the tendons under the foot, my arch has dropped, my Achilles is strained, my calf is tight and so are my hamstrings all on the same leg - any one want to swap a leg? Managed 5 miles Friday after physio and it feels a little better today - using a hand held massage machine about 4 times a day - it's race day tomorrow at Wilmslow so I'll see how it goes