The VLA version C42 is a homebuilt, so can only be used for training if you own it outright I'm afraid.
To be honest, the BRS is no big deal -it's really there in the Cirrus to get the manufacturer around some handling deficiencies (the spinning characteristics don't, I understand, comply with the certification standards). I'd just concentrate on finding a good school with a good training aeroplane.
The ubiquitous Cessna 152, PA28 and Cessna 172 are all great training aeroplanes, and very common. Finding a good school can be a little harder work! There are loads on threads on that subject however.
If you fancy learning in a C42, go to a good microlight school such as Airborne at Popham, who use the type. But most of those won't use the BRS either. The C42 is a very good training aeroplane and you'll enjoy it.
I can't say it would worry me - I've flown with BRS for test programmes, but would not regard it as far off the bottom of my wishlist for most flying. Good maintenance, and especially a really good instructor and a user friendly airfield, are far more important when learning - and a pilot's professionalism and currency thereafter.
G