So this phone is absolutely great! The keys are slightly rounded, the pressure point of the keys is much better than the previous SL785, it's perfect and exceeds my Nokia phone. The charger has undergone a revision: Now come back 2 stable charging contacts for use, not as in the SL785, where a delicate and often jammed Header was installed as a charging contact. The voice quality is also very good, not noisy, the interlocutor can be clearly heard and it is also very well represented at the other end of the line. Compared to a Swissvoice Avena voice quality is at least as good, but this is better, is the Eco + mode: When Swissvoice Avena I used from time to audio dropouts and interference in the Eco mode, but not the SL400, no matter where I was and what was between them, there was no interference of the transmission. The display is bright and sharp in the diagram Menunavigation is implemented promptly, there are no delays. The display can be disabled, who has the phone next to the bed in the charging cradle when not in use, appreciate that. The build quality is really very good, no plastic bomber, but a high and unrivaled good in design product, there is no opponent in the market. Accessing and be happy.
