I’ve had this j7+ for about a month and so far have NOTHING to complain about. Previously I had 2 i7 Roomba (one on each floor of the house). One of them died and I replaced it with the j7+.
The j7+ does a better job of picking up, it mapped the house very quickly, has NEVER gotten stuck under the couch or on a rug. Has always returned to charging base and docked itself successfully. (My old roomba routinely wedged itself under furniture & didn’t have the power to pull itself back onto the charging base and would run its battery dead trying to redock).
I love the large dust bin with a bag that traps the dirt. We have 4 dogs in the house and the old sweeper did not have a large bin and some days I had to empty the bin more than once for the sweeper to get the job done…with dust and hair floofing up out of the trash and into the air everytime I emptied the bin.
With the number of pets we have I think the large bin all need a bag replacement about once a month.

I’m really hoping the other old i7 I still have in the basement will die soon so I have an excuse to buy another j7+.

I got my Roomba seven months ago and love it. I've owned two budget brands (Laresmart and Tuya) and a Shark, but only the Shark is worth comparing.

The Roomba is much smarter — it doesn’t get stuck, fits under most furniture, and updates its map automatically when I rearrange things (which I do often). The Shark struggles to avoid obstacles, gets stuck easily, and doesn’t fit under low spaces like my kitchen island. Plus, its app is clunky compared to Roomba’s, which is easier to use and more feature-rich.

Poor

I bought mine seven months ago and absolutely love it. I have owned two small brands Laresmart and Tuya. I also have a Shark. The first two mentioned are not even worth comparing because they’re such low quality but I’ll give a comparison to the Shark because I had higher expectations for the Shark.

There are more smart features on the Roomba compared to Shark. The roomba never gets stuck around furniture or other things on the floor. Plus it’s small enough that it can fit under most of my furniture. The shark isn’t smart enough to avoid areas and I’ve seen it take over half an hour of trying to get unstuck. Additionally it’s taller in height so it doesn’t fit under places like my kitchen island. Additionally if I rearrange furniture (which I do a lot - thank you adhd), the roomba figures it out and updates the map automatically. With the shark, I have to delete the map and have it re-explore to rebuild the map. Additionally the app is easy to navigate and has more features than the one for the shark.

So far i have really enjoyed the J7+ Roomba. I had previously tried a different Roomba that did not have smart mapping and was disappointed in how it navigated my house. With the J7+, this thing learned they layout of my house immediately and was able to avoid anything in its way.

Some highlights:
Great suction, picks up pet hair better than my previous vacuum
Smart map allows it to learn the layout of your rooms quickly
Avoids obstacles