I agree with Smokey 73, The TX-6 or 7 is an amazing unit. I have had the HovaBator basic unit, the Brower Top Hatch as well as my TX6 which I did buy on
ebay at about half price.
The Top Hatch offers some nice features not found in the styrofoam units. It is VERY east to clean. It like most operate best in a room with stable temps. It is improved simply by wrapping the tub with bubble wrap. It has an electronic thermostat, which I feel are more accurate than the wafer type found in the styrofoam. You do not remove the heat element when you open it but a clear hard plastic top. Wate is easily added by using a straw through the top vent. It is durable and I believe that it will last much loner than the styrofoam unit. Downside is the light flashing that is the heat source and it makes some noise. I kept mine in a closet and it was not trouble.
Smokey explained the Lyon TX units
Hovabator and Little Giant have several models to choose from and if you spend time reading this forum you will be able to tell the issues with the styrofoam units. Once you get a GOOD thermometer and Hygrometer and a stable place to put them they work fine. Though I have never been particularly happy with the results I have had. I just bought a new one to hatch the last eggs from my flock after I had to depopulate. I have the forced air unit with turner. I ordered the Top Hatch to get a unit that would hold more eggs but it arrived broken and I am very sorry I had to settle for the HovaBator.
I recommend getting one with a fan and turner, not matter the brand you buy. Most people want to upgrade shortly after using the basic model the first or second time. It depends how much you think you will be using your incubator as to which one is the best for you. If you feel you will be raising chickens for sometime to come, I would save my money and check out
Ebay and Eggbid weekly for a good used Lyon TX-6 or Tx-7, they just can't be beat for accuracy and reliability