There is NO comparison 3 vinyl 4 track windows. 1. Ez breeze. Too many moving parts nylon pins break all the time and cant be purchased each window is a different size so not interchangeable

2. Craftbuilt. Based out of Philadelphia. Looks like a sunspace window but cheaper materials and lighter weight. The vinyl looks like it has wrinkles in it always and the metal bends really easy

3. SUNSPACE. You cannot get better than this. Heavier aluminum frame majes it durable. The vinyl is as clear as glass. No moving parts. The windows sashes are all interchangeable this is sumply the best product with the best warranty and serbice on the market all others are 5 year this is 35 year. Usually sunspace is a few hundred more than the rest but the difference is well worth it