Had a pair of Nimbus 16s a few years ago. After the first pair wore out I went to a different ASICS shoe because it was a good deal when Sports Authority went out of business. Now they were end of life so time for another new pair. The second pair never quite felt right on my foot and I know my motivation to run suffered. I even starting having issues with a mild but persistent case of plantar fasciitis. So I'm back to Nimbus, this time version 20. Thanks to everyone who mentioned to order bigger than normal, they are a perfect fit with size 12E even though I normally wear 11.5D. What a difference! I run on the outside of my feet (under pronation), and these definitely are made for people like me. I feel back to normal and once again looking forward to the afternoon run. My legs and back are happy too. My only complaint is that the only color available in my size was black.

I was hesitant at first, not knowing whether to order these in wide or x-wide, but as fate was looking out for me, x-wide was the only one available at the time in my size. Had i ordered just wide, they would have been way too tight, because the x-wide seems to fit like a medium shoe. I've always felt this shoe brand carries mostly narrow shoes, until I was referred this particular shoe for Plantar Fasciitis, so I thought I'd give them a try. I'm not 100% sold on them yet... i need to wear them more.

Update:8/30/19 I now have 2 pairs of nimbus 20 10.5 extra wide and they are great! But asics only makes the wide and extra wide in the carbon black model. I had to get extra wide to come the closest to fitting like nimbus 18. I would give 5 stars but it shouldn't be that difficult to find comfort in newer models from the same manufacturer. I have a pair of asics nimbus 18 size 10.5 standard width and they fit perfect. I can be on my feet 10 hours and they don't hurt. I then purchased nimbus 19 size 10.5 and they were way too small in length and width. sent them back. Then after reading reviews I realized that many people had the same problem with the nimbus 19. People also seemed to have a similar problem with the nimbus 20 not fitting in width. I really appreciate that the nimbus 18 were so comfortable all day and fit perfect. Anyway I tried the nimbus 20 size 11 and they were just a little to long, sent back and now I have the nimbus 20 size 10.5 WIDE and they fit ok. When I compared my nimbus 18 size 10.5 to my nimbus 20 size 10.5 wide, I found that the nimbus 18 are wider by 2 mm. The nimbus 18 regular is wider than the nimbus 20 wide. In my opinion asics may have decided to shave a couple millimeters off the product to save money in the manufacturing. The nimbus 20 does not fit as comfortably as the nimbus 18 either. The nimbus 20 wide is still more narrow at the toe than the 18 was. The length is fine. I am on my feet at least 10 hours a day and need shoes that are comfortable all day. The nimbus 20 feels comfortable so far. I have not spent an entire day working in them yet. I will update that after a few days in them

I'm not an avid runner, nor an expert on running shoes. I just did research into top 10 running shoes (for running on pavement) because I'm hoping to get back into running after having had some knee problems several years ago. I need something that is going to be gentler on my feet as well as provide knee protection for pavement-running impact. I read about this shoe and also had a friend that told me his doctor uses Asics when he runs and swears by them, so I tried a pair. Not sure that paying $160 for a pair of running shoes is worth it, but I have to say that upon trying them on I felt light and "lofty", almost as if though I were kind of walking on a "cloud", if you will. Haven't used them for running yet, but took them for a quick sprint and they were lovely. No complaints. Very happy with these so far.

I'm a long time Asics Nimbus/Cumulus user, but a few years ago I decided to try other brands too to find something with a little less cushioning. I tried Brooks Glycerin which were way too soft and out-sole was not durable; Mizuno Wave Rider that had a very durable out-sole but the cushioning collapsed very quickly. The last NImbus I had was the 12 that I put almost a 1000 miles on! I liked them, but thought that the cushioning was slightly too soft. So couple of weeks ago I bought the Nimbus 20 after reading that they were stiffer than previous Nimbus models.
I now only have 3x5miles on them, so I'm just giving first impressions. They do feel stiffer than previous Nimbus that I've had, which for me is a good thing. However, sizing is clearly smaller, I would say between 1/4-1/2 size. I bought size 11 and I'm getting blisters on the tip of my toes. It's not too bad, but if I were to run a marathon, I would buy a 1/2 size bigger.