Not very happy with purchase

Because of a baseboard heating system behind the toilet, I am limited to toilet choices because there are few that have bowls that set far enough from the wall.  I chose this brand and model simply because it fit.  The installation was simple and went well.  The old toilet worked perfectly, I just installed this new one because we remodeled and wanted a color change.  The Pegasus has an extremely weak flush which sometimes requires two flushes.  A good deal of the time it will not flush at all allowing the water in the bowl just to lower a bit and then fill up again without any flushing action at all.  I have uninstalled the toilet two times now and checked everything including our house plumbing or the outside chance there may be some obstruction in the toilet itself.  Although not a professional, I am a fairly savy do-it-your-selfer and am convinced the the Pegasus has real problems.  Will be ripping it out and finding a different brand that will fit the installation requirements.  Beware!
Almost forgot!  The original seat was worthless.  It was super cheap and looked like it was made for completely different toilet bowl.  Replaced the first day.