Can't say I own one myself, but the features should give you a pretty good idea of how it'd compare to other locomotives of that vintage as far as performance.
The motor and die-cast trucks I'm 99% positive are the same as used in the F3s of the era. Just bear in mind that it only has one powered truck.
Stamped steel frame with a Die-Cast fuel tank.
As Larry mentioned, it won't have the power of a dual motored F3, but I think you'd find it would have plenty of power for average running conditions. I'm not sure how much the weight difference (if there even is much of a difference) between the Die-Cast frame of the F3s and the stamped steel frame/diecast fuel tank on the EP5 would factor into things.
I have noticed the prices of F3's, especially the 2333 are all over the place. $150 - $1500. According to Greenbergs "good" ones should sell for $225 but as we all know ebay has ruined those values. I get decent prices at shows but the products are 90% junk. People just bring their problems in a box, buts that's ok, I fix them
I've never had an issue with the pulling power of my Williams diesels with dual motors (traction tires probably help a lot too). The only difference with that ALCO would be the weight since it's smaller than either of the locomotives I have.
I have more than one #2350 series. They have a lighter overall weight than the metal-framed #2023-style Alcos, so they really pull more like typical geeps of that era. Decent pullers, and probably exactly like the #400-series Budd cars which have similar stamped-steel bodies, horn, etc. spread out over 16 inches. With only one motor, they're still good pullers if treated right and maintained properly.