I have two Rule pumps that are hard wired in the bilge. An auto 750 rainwater pump and 1500 main manual switch pump. They were installed by the previous owner and must be almost 15 years old. So far they have been bullet proof and extremely reliable. They were last tested (deliberate flooding of the bilge with the fresh water hose) and the baskets cleaned about 3 weeks ago. The bilge was also cleaned to remove crap that could clog the impellers. In the nine years I have owned them they have never clogged the impellers or float switch and always worked (touch wood).
I have heard nothing but complaints about newer designed pumps with all their complex electronics and sensors sitting in salty bilge water. They all appeared to be far less reliable, quick to fail, maintenance intensive and quicker to drain the batteries than the previous generation of pumps and seem to turn on (wasting battery) just to check. It is not just Rule but all manufactures with new style sensor controlled auto switches. My older early generation 750 with the built in auto on switch works with a simple internal vertical float switch. There are no other sensors or electronics to fail or draw amps constantly. The float goes up. it comes on, it goes down, it turns off - an extremely reliable and simple design that works something like your toilet.
It may be that new sensor pumps can do more and be asked to do more in the future, such as tell the difference between fuel and water so that if your tank leaks fuel or the motor leaks oil into the bilge, it won't pump it into a small lake. Larger boats/ships with more complex systems require that bilge water first go through a fuel/oil/water separator before being pumped overboard.. My guess is that once governments and environmentalists started to worry about this, the sensor pump was born, Perhaps in time, manufactures will learn to make them more reliable but the salt water boat bilge is one harsh environment for sensors and electronics and people are not going to want to pay thousand of dollars for a bilge pump on a small boat that may still have to be replaced every few years.
Having just one small old school non sensor auto rain water pump has one advantage, in that it will draw no amps when not pumping and less amps overall, and the batteries will last much longer when sitting at the dock for any time. Unless you have shore power constantly charging your batteries, using a big high powered, high amp draw, sensor auto pump or multiple sensor auto on pumps will kill the batteries much faster and once the batteries are dead there is no pumping at all. I guess it depends on how often you use the boat or check on the bilge, the pumps and the charge level of your batteries, especially in the winter when it rains hard a lot with our west coast rain forest environment.
Our old school 750 float auto pump can keep the rain water out all winter, while dry land stored 2o miles away without getting close to killing the batteries, but it is best to get out at least once during the winter to check on it and top up the batteries. New batteries this summer.