iSDT N8, N16, N24 Charger

Anyone own and use the iSDT N8, N16, or N24 charger?

For future reference -

Any difficulties in using the touch buttons (particularly with either buttons not always responding, or overly sensitive buttons where a single touch may be misinterpreted as a multiple touch)?

Any heating issues with the charger and/or with cells being charged?

Failure to stop charging cells?

Any other issues with the charger?

Anyone?