I like them a lot. I've used them exclusively for my downtown (The gray building, the start of Wonka's factory (not to sclale) is a Walther's as well as the Fuel depot) on my current layout project. They are fairly easy to build, but, be sure to check square. You're just butting up flat surfaces in them, so, if your'e not careful, they can get out of whack. I like detailing work (Still have a lot to do on them) but, as you can see, you can still hold the brick detail pretty well with them. Of brick building models, these have been my favorite to put together and detail. They have a pretty solid feel to them after completed. Not something you can say about a lot of N scale stuff.
The only negatives are that they are lacking a lot of detail stuff you might normally want. Downspouts, roof vents, etc. Price wise though, these are all easily added. And as was mentioned before, they don't look good out of the box. They must be painted. I sprayed everything with a base coat first. Then added the details later.
Here is some of the detail I've been able to achieve with the brick. I have yet to paint the window trim in this picture, but, that's my favorite part of the hobby, the building and painting of kits.