It's a bad deal.
To make the trade completely equitable, he should be giving you cash and a Glock for your pistol.
Of course, he can't make a profit that way, so he is being businesslike and reasonably ethical.
In truth, the 1911 is the better target pistol, particularly as a "learner." In my personal opinion, it's much easier to shoot well than the Glock will be.
As a concealed-carry pistol, however, the Glock might be the better choice.