Yes, I also had a speculum like that...the effect cannot be compared with this mega anal stretcher. I added more screws to it to get a rounder, wide open hole. However, it's not easy, and at times it's quite unpleasant... but the look inside is amazing.
must be a son of a bitch to move each prong in place to STRETCH that hole. (i used to have one of these small speculums that was just two spoon-like flaps that i can expand with only ONE screw.)