Summit (Harmar now) is average at best and far from bullet proof in my opinion. The open rail system attracts dirt and requires constant maintenance compared to most. Also, the nylon rollers will wear out prematurely if not kept well greased. In addition, it's not uncommon for the unit to set the safeties going down with no load. If the stair slope is low or grease too stiff, then the unit will start bouncing and set the safeties. I found this to be a common problem.
I prefer Stannah as they have a far superior rail system and no travel cable to hang up. The cog system is in the back, tucked under the rail, faces down and is not exposed. This type of set-up is protected form dirt and falling debris. The simple brush system eliminates a travel cable and all the problems that come with it. I was also surprised to learn that Stannah has been in business for over 100 years. Sometimes time tested companies speak for themselves. ;-)
I switched from Summit to Stannah around 2008 and never looked back for many reasons. The Stannah reminds me of the old rugged Wecolator built by the Cheney Company we use to install years ago. This was before Access Industries took them over, and then Thyssen. We use to put in Bruno which was real crap for the first generation but got much better. Not sure how they are now. Anyway, that's my two cents.
Last edited by Do the Dishes; 12/02/14 03:49 PM.