I played on a 6 for a while before switching to Warwick. They are great basses, and most of the hate as has been said earlier, comes from online snobs that hate everything that isn't a fender P bass with tort pickguard and flats.
Appearance wise they are unique and they 100% look better in person. The finishes are great.
Tone wise they are very versatile and the 4 band eq can get you some great useable tones.
Playability wise they fit well in my hands, and i could slap the 6 string like a pimp slaps his....... Ill stop there.
Downsides: the woods. Basswood body dents if you look at it wrong. Maple neck and rosewood fingerboard, while classics, don't fit the "modern musician's bass" vibe that EBMM pushes for the bongo.
Don't get me wrong, those tonewoods aren't bad, but if they made a bongo with roasted swamp ash body, wenge neck and fingerboard, that would be killer. (Worth noting, if you can get your hands on the Premier dealer network editions, they have special woods like mahogany, roasted maple necks etc.)
If you are going to drop 2-3k on a bongo, try and grab a ball family reserve or PDN version, as it will hold its value more. But every person i have actually played the bongo in front of in a live setting has loved the tone and the funky, #&@$ the fender establishment design. (Again the finishes are AMAZING)
TLDR: great and useable tones, very comfy to play, weird but cool design, vanilla tonewoods , buy the Special editions as they have better wood.