Everyone I've talked to who's flown the 2 and 3 versions has found nothing particularly exciting about the low speed handling.

I've only flown a Standard 1 and it was quite different. When I flew it I noticed it would give very obvious signs that the stall was approaching (strong but not scary buffeting of the tail and the ASI needle would shake around due to turbulent air striking the tail mounted pitot) but there was only a few knots difference between flying happily to buffeting to stalling with a fair wing drop. I spun it deliberately a few times and found that compared to an L-13 it would be more nose down, would rotate a little faster but was very predictable and stable in a spin like the L-13. It did require deliberate forward movement of the stick to recover from the spin unlike the L-13 which would stop rotating with just full opposite rudder. I never got into an unintentional spin with it though, just a couple of wing drops when thermalling.

That said, even the particular Standard 1 I flew (which had rather eventful life) had flying characteristics that I would consider less than ideal but would not be a problem for anyone who is competent and safe flying something like an L-13 or L-23. Since the 2 and 3 seem to be more docile I would think it's quite suitable even if you've been trained in more docile two seaters like the twin Grobs.