The Snap On'* are fairly good scanners. Matter of factly, they are probably the best ones besides Tech 2'*.
I guess the main question would be is, what do you want the scanner to do? Are you only interested in just logging/scanning data? Or just checking/clearing codes? If it'* logging/scanning, then you need a laptop. A laptop is much faster at reading all data and converting it to data that you can read and understand. Handheld scanners just don't have the processor power to do all that at at DECENT frame rate.
Now, if that is the route you want to go, you need to find a decent OBD 1 data connector with software that can do that. I'm not sure if that stuff is made anymore. Someone else here may be able to add more info.
Now, if you were 1997 or newer, you could use HPTuners. Well worth the $500.
1997 Pontiac Bonneville SEi-SCRAPYARD
2000 Chevrolet Blazer LT 4X4 4.3L
2002 Chevrolet *-10 LS Ext Cab 4X4 5.7 V8