After labouring with 10-12 cm handle spanners found at home, and having no luck with removing those pesky pedals, I finally decided to throw in the towel and buy a proper pedal wrench. Park Tools were my first preference and, as usual, did not disappoint. After reading a few mixed reviews online about said wrench's performance, I can safely say that (based on my humble experience) it works really well and gives the wrists a break for a change!
I am not mechanically minded by any stretch of the imagination, but this fantastic wrench just couldn't have performed any better. 10 seconds of tugging on each side was all that was required to remove both pedals. The 29cm handle really makes it easy to apply the correct amount of torsion required to remove even the tightest of pedals.
Certain reviews online may indicate that the wrench head is a bit too thin. Be that as it may, I wasn't the least bit concerned when using it with my SPD-SLs.
As for construction, the wrench itself feels solid and well built when held. And provided it isn't abused, it should last for a good long while.
Will recommend for potential consideration. Worth every penny!