Pros:
There really aren't a lot of pros here.
The main pro would be that this "course" is located on the grounds of an elementary school, so children can be introduced to the game. The actual layout is great for that as well. There are no teepads, and the baskets go in numerical order in a clockwise pattern around the field. I assume that this means that the kids (using Frisbees of course) will just go in a circle throwing from one basket to the next. While this would bore any golfer and most kids, it's a good way to get their feet wet.
From here on out I'll be reviewing this as the safari course that is mapped out on this site.
The safari course is decent due to some of the longer holes, so if you follow it you do get a chance to air it out a bit more. I played the whole thing with a Buzzz, but holes like number 2 don't make the use of a driver out of the question.
The big asphalt area in the middle makes this an ideal place to break in a new disc... And the fact that the course consists of a circle of baskets around a field means that you can introduce new players to the game here or just work on your field work with baskets to make it more interesting. The ability to introduce new players here is a major pro, and the only thing that keeps me from rating this a "0". With Lakewood and SeaTac (water and monster holes) being the only courses nearby, it helps to have a place where you can take somebody for their first round without worrying about overwhelming them or having them lose your disc.
Cons:
The baskets are homemade and are falling apart. Another reviewer said that two years ago, and they're in even more abysmal shape than they were back then. This course will never see traffic (I was probably the first person to play here since sillybizz), so it just isn't worth repairing. The fact that some of the baskets had crumbled to the point of exposing nails is a travesty though. This is a PLAYGROUND.
There is very little challenge here unless you play it as a safari course. The one detailed on this site is interesting, but is not worth a second play through. Being nothing more than a safari course, there are no signs and no teepads.
Most of the safari holes throw across an asphalt play area, so this course is a no no if it's a nice day or if there are kids around. And of course nobody should play here if school is in session.
This neighborhood is a bit seedy. It didn't feel that way when I played there, and there were a few parents with their children enjoying the sunshine/clouds, but this isn't the safest place to take a date if you know what I mean.
Other Thoughts:
Sanislo was a nice idea when it was set up, and I'm sure the cheaply made baskets were fun several years ago, but this is a course that just needs to be shut down. I hate to say it because Seattle proper needs more courses, and I did mention the value of an easy "introductory" course in my pros... But really. This one has fallen into disrepair and the baskets are both hazardous and an eyesore to an otherwise attractive playground area. I saw a girl climbing on one of the baskets, and even if I hadn't, I would have known that it happens. I was young once too. What if she had chosen to climb on one of the baskets with rusty nail points sticking out of it? Baskets are not a jungle gym, but in this setting that's all they'll ever be.