Just my limited experience of 4 flights with them, once from Maputo to LIS on a 340 and then a few days later to Germany on a E190, second from Germany to LIS on an A320 and then on to YYZ on an 330 (not the neo).
Very mixed experience depending on the plane type and the crew.
A340 had ancient angled flat 2-2-2 seats in business class, relatively dense and not well kept.
A330 had staggered seats 1-2-1 and 1-2-2 alternating, very similar to LX, SN etc. Seat was ok, a bit on the narrow side (other airlines have wider seats for that kind of design).
E190 seats were nice, 2-2 (eco is 2-3) with good recline and comfortable
A320 was horrible. Seat did not recline, almost no padding with an empty middle seat. ryanair is more comfortable.
Crews were between indifferent and nice, never bad.
Food in general was unedible.
Lounge in LIS was ok, not stellar, a bit overcrowded in both cases.
3 flights more or less on time, 1 flight over 3 hours delayed and clearly caused by the airline (first crew timing, then a broken curtain and chaos in the needed reseating)
I used them because their price for the one ways was about half of what other airlines wanted, and the almost free stopover in LIS was a nice addition.

I would avoid the 340 and the 319/320 and use them again if their price is better.