I used to ride a miyata 610 - I loved it, but the issue is that after modernizing these older bikes you end up spending as much as you would on a new bike but with less satisfactory results. I now ride a Jumbo Cannondale T2000, and it's a sheer tank of a bike.
My touring partner had a shogun - the bikes are fine, but I would say in all respects identical to all the other japanese bikes made during the same time.