Not so close to marathon, but are worth a go. I have been running in Newtons since Jan last year, and I love them. However, I was already a midfoot striker and did some of my running in minimalist-ish shoes so the transition for me was reasonably straightforward. I soon found it very difficulty to run in my clumpy old asics - they felt like bricks attached to my legs!
As to whether my running has benefitted, I think it would have done if I was doing the same amount of training as before, but I'm training a lot less. However, a few miles into a longer road run I really start to feel the benefit - I find it easier to settle into a faster rhythm somehow. But if you are not a midfoot striker, it is going to take time before you will feel comfortable enough to reep a benefit from it.
The performance benefit depends how fast and how far and how regularly you're running to start with. For example, if you jog 2 miles twice per week, you aren't going to need expensive kit. However, if you train twice a day, with one of those runs at a high percentage of your maximum, then kit that increases comfort and aids recovery like compression tights, performance shoes etc.. will probably be more important/necessary/beneficial for you.
Unfortunately, it is a bit of a cycle - when I was a student training a lot more and faster, I would probably have benefitted from better kit. Unfortunately I couldn't afford it until I was working, and thus have no time or energy to train at the same intensity!!
Hi Chris. I'd give it longer just in case they rub - if they give you blisters breaking them in, you want enough time for blisters to heal. Can break them in well in advance, then stick them in the cupboard until the race.
I have a 2XU long sleeved compression top that I used instead of a rash vest for dinghy sailing, usually under a wetsuit. Felt it helped me recover (my weedy little arms would suffer from pulling bits of string for hours), and kept me a bit warmer on the water as well.
I've never run in it, simply because I get too hot even in a normal LS top and jacket after a couple of minutes running though.
Needless to say I quit the sailing because running was warmer...