IMO Marriott has done a really good job with SHS. The new build properties especially have very functional, comfortable rooms, the breakfast is actually pretty good, and the staff are generally friendly and competent. I'd also agree Hyatt Place is the closest analog (and maybe Aloft, but I haven't stayed at one of those yet).

In the two locations where I regularly stay at an SHS (San Diego and Modesto), the price is typically in the ballpark of the full service competition. But I find clients don't complain because they know these are not "luxury" hotels.