@gregbatch , you probably know by now that I used to sell KM production gear. I sold several of the 2250's, mostly to school districts and county in-plants. The 2250 is just two 1250 engines paired together with a bridge so each engine only prints 1 side. If you run 1 sided prints, it's only running at 125ppm, two sided prints are 250ipm (impressions per minute)...therefore, it's only a worthwhile investment if most of your prints are double sided.
The 1250 series was quite reliable - we had them at my current job (county inplant) for about 6 years before upgrading to the 6136's. The 1250's (and 2250) came out roughly 8-10 years ago, and were replaced by the 6136 series about 3-4 years ago, so I suspect they will eventually make a dual engine out of the 6136's.
Feedback from the customers I sold it to was mostly positive. The first account I ever sold one too wished they had opted for more paper drawers because it is fast and the operators were having to refill quite often. You can add up to 3 vacuum-feed paper decks with 3 drawers each (total of 11 drawers since there are 2 friction feed drawers under the first engine). You can program the job to automatically switch to the next full drawer and you can load while it's running. Customers who switched from Xerox to KM usually note the reliability of the vacuum feed since you don't have the feed tires that wear out or slip over time.
Another account told me they wished they got two 1250's instead of a 2250 because they would get the same performance, but have redundancy if one went down. I personally lean this way as well.
Initially the 2250's were only sold with the KM controller, but now they offer an optional Fiery controller.
What type/size of stock are you running? Will you need any finishing?