I have a 1588 - it works brilliantly. I have been using this model for over two years. I do hatch in an LG forced air. I do multiple hatches so I have two incubators.
I had no luck with the LG still air - the temperature spikes killed several of my hatches.
I paid about 150 for the 1588 with a turner. I know they have deals that you can buy them cheaper if you shop around.
I use a turner. I think it makes my life easier. Although I know folks don't use them and do just fine hatching.