I've had a Porter-Cable 0314 4-1/2" Trim Saw since the 1980s - and it was such a good design, the current version is virtually identical.  (E.g., mine has round knobs; new knobs are triangular!)  Being corded, it will also be just as good 20 years from now, given that I won't use often enough to wear it out.  This is one tool to hand down to your children...