[Good]
Consistency - I've only ever had ramen at Ajisen and it's remarkably consistent in terms of flavour even across locations. The broth flavours are rich and enjoyable.
Steak - Teppanyaki steak is done nicely. The steaks come out rare on a sizzling hot plate and cook to just the right temperature. Meat is fatty enough and tender. I'd say pretty good quality and I would get again and again.
Stamps - Added bonus to get free ramen.
[Bad]
Price - All items on the menu are jacked up now, presumably due to minimum wage increase. $11.50 for a basic tenderous pork ramen. I'm pretty sure it used to be $8.50 or something. At this price point, you might as well pay $2 more to get steak ramens. Prices are starting to close in on higher end paces like Sansotei. Cucumbers used to be $1 and now it's $3.50!
[Worth it?]
Borderline. I would say the higher end ramens are still worth it as the gap between the cheapest and the most expensive bowls close in on each other. The stamp card helps provide a little more value.