I have had my Xi5 for about 18 months with no issues. I absolutely love it. The only downfall is the foot pedal. It is pretty tough to use. It is nothing at all like a cable steer so if your used to one of those and like to run up and down banks it will be a big learning curve. I usually just put mine on cruise and let it run and just do small adjustments every once in a while when needed. If you try to leave you foot on the pedal you will end up spinning yourself in a circle.
The spot lock is probably the biggest upsale. It changes the way you fish. I usually will anchor up on a windy point and go fish off the back deck if im alone depending on wind direction. Its also nice when you have to retie, to hit anchor and not get blown off your spot.
I also do a lot of trolling with it and it is nice to record the route you want to troll and then go back and just hit a button and it will run the exact route. I could troll for about 7 hours straight on to cheaper orielly batteries, so i would say it is pretty easy on juice.
I read a lot of people complaining about the Ipilot being loud when turning. The Xi5 is very quiet and it turns very fast