My 1985 H34 came with a Lectra-San toilet when I bought her five years ago. No idea how many years from from new. Works flawlessly, simple system in saltwater - no need to have a salt feed as in fresh water. The two-stage hydrochloric acid (from the salt and electricity) process and maceration take care of any solids and bacteria to the point of being benign.
Only two hitches:
1. If in brackish water like some river deltas or marinas with low tidal sweep, and the salt content of the water is insufficient to register, the system will not work at all, showing a low-salt warning light. On a single-head boat, that's a concern! Thankfully, this does not happen often.
2. Finding a bowl cleaner that does not harm the electrodes when flushed is a challenge. I am sure many electrodes have been short-lived due to sailors using their 'normal' stuff. Check with Raritan for what's recommended.
Apart from that, a perfect unit. Highly recommended.