I can't compare the 510 to a 901 (Don't own one) personally but will give my thoughts.
The 510
The Positive:
That is all I could think of off the top of my head at the moment. Hope it helps!
Also:
The manual switch is highly recommended for this model. There seems to be so many issues with the auto from what I have read.
Note: I only have 2 801 models to compare the 510 to.
The 510
The Positive:
- Atomizers seem to be very solid if taken care of. I can't tell you when they die because I still am using one for almost 2 months. Janty picked a great name with "Dura"
- Vapor production is great especially for such a small atty
- Will suck a cart dry if used correctly and topped off
- Doesn't leak much unless you really overfill it.
- It's very small
- When atomizer is faulty, will not cause a harsh burnt metal taste. From my experience these attys either work or they don't.
- Battery life is very poor. You will need about 3-4 batteries for an 8 hour period (PCC and good USB Passthrough is highly recommended)
- You must drip or top off very often if not using a cart mod. The cart is very small and doesn't hold very much liquid.
- Blank carts are slightly more expensive if buying in bulk
- Draw is slow and hard compared to 801 and drags take a bit longer to produce a ton of vapor (Small atty surface area)
That is all I could think of off the top of my head at the moment. Hope it helps!
Also:
The manual switch is highly recommended for this model. There seems to be so many issues with the auto from what I have read.
Note: I only have 2 801 models to compare the 510 to.