OP, I can give you some insight to Dollar Academy if that would help? I have zero knowledge of Bearsden academy.
Both my DC went to Dollar, the youngest leaving two years ago. Have you been through the entrance process for this year or are you thinking about the future? The entry points you mention ( J1 and J2) are a good idea. The existing children will have moved up from prep school and more classes of new pupils are added, so your children would be joining in a large group of new intake.
Dollar’s facilities are quite impressive and their list of extra curricular clubs equally so, I’m not sure there is not much they don’t offer or can arrange. The grounds as I’m sure you are aware are large and beautifully kept.
Academically it does extremely well. It does not stream out pupils at senior school entry, so if attending before this stage a child will automatically move through the school. Academically children are challenged and there is a lot of flexibility when choosing NAT 5, higher and advanced higher options. It is quite competitive academically, which is a positive and negative. Children do tend to strive to do well and for those not always achieving that level it can been challenging.
Discipline is as you would expect not an issue and unruly children are dealt with quickly and appropriately. That does mean there are zero issues, there are of course and like all schools incidents of bullying do occur, but in my experience are dealt with. In the time my DC attended and I know of a handful of pupils that were asked to leave due to their behaviour.
Some locals have a poor opinion of the school and view it with a certain level of hostility, and will given the opportunity criticise the pupils behaviour for being elitist. There are obviously some parents/children which fall into this category but most don’t.
On the whole we were vey happy with the school, my DC gained entry to the university/ course of their choice, but so did their state educated friends. It is a financial burden (c250k). If I had the time again and the option of moving to the catchment area with an excellent state school, I’m not sure what I would do.