Im sure someone else will chime in here.. and there have been other posts discussing the same thing..
My take from reading past posts from spending last weekend spending several hours researching buying a KK/Howse rotory mower vs a JD/frontier brand.. I think both KK and Howse are very similary in quality - and both will more than likely do what you want them to do, but you just cant abuse them as bad as a heavier, better quality mowers.
The KK had a very poor paint quality and will probably already be rusted by the time you get it home. They do not come with a slip clutch (~$65 online or $100 locally and you have to install it). There are no safety chains you can buy for it, you will have to make your own. The sheet metal is not as thick and therefore will show dents/dings easily. The mower deck is not made for water to run off, so it would likely pool and start to rust if left outdoors.
The Howse (IMHO) has a much better paint job, and does have chain kits available for them (from about $130 and up depending on size). it does not come with a slip clutch either. The sheet metal is also not as thick and water would pool on it as well.
I was seriously considering the howse over a LX4. the dealer was pricing the lx4 at around $900 - 1,000 - Northern tool had a 4' for $699, plus $130 for chains, plus the slip clutch ($65/$100 which i would have to install myself). - lowest cost would be $894 to $929. I would also have to borrow a trailer and go get the mower myself..
Good luck with your decions.. A LOT of ppl have purchased either and have gotten great service out of them.. But like a lot of things "your mileage will vary".. LOL
Brian