The single-screw two-post design is a little difficult to work with when you're using complex coils. For instance, I found that with a 28ga+34ga staggered clapton, I couldn't fit two coils because the coil legs couldn't fit inside the post hole. together.
With any of the internal chimneys (airflow control) installed, it's pretty much impossible to fit a coil larger than 3mm inside diameter without having the coil ground-out on the chimney.
That said though, it's pretty easy to install smaller coils. The included silicon coil cap makes it really easy to run a single-coil configuration without having to over-pack your cotton, and the airflow is pretty damned amazing for DTL vaping. If larger diameter and/or more complex coils could fit without issues, this would get a 5-star for sure.