I rehydrated, and as with the others I disliked the flavour and the poor adhesion to bottles.
The Belgian yeast is good though, my Patersbier is delicious, and lovely and crystal clear. The Saison De Lille tasted nice, but under attenuated, but still had problems with the sediment been too loose in the bottle. The Kristallweizen was a good yeast too, the wheat beer was delicious and became very clear in time.
It's literally just the Real Ale yeast and the US Pale Ale yeast that I didn't get on with. I've mentioned before though, I suspect that it could well be that they're just not very tolerant of fermenting at temps much higher than 20 degrees C, where other yeasts are far more forgiving (the CML ones I like for example ALL ferment best at temps above 20 degrees C...). If you've gone to the lengths of building a brew fridge though, surely you'd go the extra bit further and use liquid yeasts rather than dried?
So no, rehydrating probably won't help. Keeping temperatures down though might, if you can.