VeryGood..
There was a time when a mechanic that was savy could diagnose a common automotive circuit with a test lamp and a couple of jumper wires ...then the DMM came along , giving the user an expanded view into these electric circuits ... cool, ....but now we have gone from Basic Electric circuits to High Tech Electronics ..so, a Scope is simply the next generation DIYer tool required in the diagnostics process.
You can buy a good DSO scope on Eaby for less than the cost of a WSS..and once you get one it will open your world of Electronics understandings far beyond than when the DMM was " THE TOOL" to own.
[ Many of us Vet guys were brought up on Analog Meters and have a preference to them even today... I Love My Simpson 260 to this day...
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So,....... as Auto-Tech evolves with Frequency and Pulsed Code formats , along with digitized signals,CAN etc., a scope is going to be mandatory ..........almost that way already.
You can find SUN LS-2000 DSO scopes for a couple hundred ..very good tool and user friendly..keep your eyes out for one.
Here is one that also had the Ignition Probe included..$225..[ about 1/10th the original cost..not bad.}
http://cgi.ebay.com/ebaymotors/LS2000-LAB-SUN-SCOPE-from-SNAP-ON-TOOLS-used_W0QQcmdZViewItemQQcategoryZ43989QQihZ003QQitemZ130244765814QQrdZ1QQsspagenameZWDVW
...and That Pico site is a great read for anyone considering a scope.