I've had an MFLB for about 3 years, and I loved it! I say that in past tense cause I have moved on to dabs, and I don't have concentrate trays for my MFLB :(
But anyway, this is great for flower. It took me a little getting used to at first because I couldn't find the right inhaling technique, but once I got it, I was FLYING. I wouldn't feel much at first, but after about a minute, it would hit me like a ton of bricks in the face.
It is a bit pricey, but I'd still recommend this!