As others have said, approach speed does matter. It always matters, but this line of aircraft seems less forgiving than typical trainers and there have been many accidents due to porpoising. Not a deal breaker per se, but a risk that must be addressed with proper training.
Also as mentioned, performance suffers due to the cabin. I probably wouldn't consider a B19 for personal use, but for training it should be workable. Think of it more like a big 152 than a 172/PA28 when thinking about performance numbers. I do have Super Musketeer time (200hp) and that aircraft is a bit less peppy than a 180hp PA28, so you can imagine what 150hp in a similar airframe will do!
That said, they handle nicely and are extremely comfortable, so as with anything there is a tradeoff!