The Extensions are very useful & I have a few I use quite a lot, your ones are excellent & mainly for countries where the timber frame house market is single walled stud panel open frame with various claddings/sidings. PLUS-SPEC wall tools have the ability to form cavity wall construction with a cavity & an outer leaf in brick or rendered blockwork. This was of particular interest to me as UK based & we seem to build most of our homes with cavity wall construction.
I did buy PLUS-SPEC in the early days & it is a great product, however subscription-based software (renting not owning) doesn’t sit well with me & when Extensions cost more than the host product, it’s a big NO for me.
Extensions per-se do compete with each other quite a lot, but all quite unique, some free & some paid for. I’ve not thought about a larger player entering the SU-Extension market & developing a SUPER-BIM architectural tool set.
The development cost may outway the extension cost, for me, it would have to be a perpetual licence & not more than 50% of the host software.
Another factor is confidence of your investment, i.e. how long in time will a third-party product be supported yearly & work with SU-PRO’s yearly updates ? For this reason alone, I wouldn’t invest my time in costly extensions, I would want these to be part of the programme.
Over & out,