Well, I would allow that that particular one looks to be in unusually nice condition, although there are no inside cabinet pictures where all the big problems start.
I know I sound like Dave Ramsey on a rant when I get going about these current (third) generation Summits. My lame attempts at buying beat up ones to restore have convinced me that they are too heavy, too complicated and made with too much substandard materials. Here in wet Florida they disintegrate with alarming speed.
That being said, if you are buying to use, not restore, and you have a dry inside place to store this large of a grill, you will probably get a great cooking experience with it. Nice rotisserie, heavy stainless grates, and plenty of room and power are some good attributes. Just be prepared for a complicated repair and maintenance regime. If you are keeping it outside and it is going to get wet, well, forget about it!