Got the E-series 48" about a month ago. I was a little concerned about the engine but it runs great. Plus, it comes with a great warranty.
That too was one of my concerns with the Radius. I have considered selling my Lazer Z and getting a Radius or the Toro Titan ZX4800 or Timecutter HD. They are all priced close together but with the Titan you get a Kohler Confidant (21hp) and with the Timecutter you can get a 54" deck with 22.5hp priced the same or less than the Radius E 48. They all have similar warranties, transmissions, tires, decks, etc. It will be a tough decision for sure!
I got a heck of a deal on this one and I needed the 48" deck as anything bigger wouldn't get through some gates. The dealer is fairly close too, so that played a big part in my decision. That engine may blow up tomorrow but I'm more than happy with the way it runs now.
I thought long and hard about the consequences of purchasing a machine with a "company branded" engine and came to the conclusion that it would only be a mental struggle living with the fact that I didn't buy something i know and am experienced with. I was first exposed to these engines when I was shopping Toros and noticed that they were ditching the Kohler's and Kawasaki's for their own engine. Then ExMark branded the same engine for their quest and radius line. If ExMark, a brand that is synonymous with commercial lawn care, is willing to put their name and reputation on an engine, then the average consumer should be confident that it will perform satisfactorily and last as long as the rest of the machine. Obviously these engines are not meant for true commercial use and maintenance is crucial for ensuring longevity. With that being said, come spring I will be considering trading up the Lazer Z CT for a Radius. I appreciate your feedback and experience.
Mike