I use BIAB on the majority of my clients now, either over the natural nail or over tips. It's a great product and beats any other hard gel I've used. Strictly speaking it's supposed to be for medium length extensions, which is what most my clients ask for, but I've seen it used on longer, but TGB do Gel Pot which is better suited to those.
The advice I was given from TGB when I started using it and asked about applying my other brand of gel polish on top, and what I have adhered to ever since is, after applying BIAB, wipe off inhibition layer, refine and then apply base coat of gel polish brand to be used before applying gel polish.
Can I also add that I cure all TGB products with TGB lamp. Then I cure the other brands base, gel polish and matching top coat with their lamp. This way I know each brand has been cured properly. I haven't had any service breakdowns and the nails last really well.