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Hefty
Just checked on Powerwall prices, and it seems to be approx. £9500 + 0% vat installed with solar for 13.5kw.
Its a high unit cost, but good price / kw. It used to be one of the lowest price per kWh of storage on the market.
DC only batteries can be cheaper, like the Growatt, Fox and Pylontech, but the Tesla is better value per kw compared to other AC coupled solar batteries from the likes of Puredrive.
Also the backup power, and high power delivery + increased surge power delivery means more reliable battery usage.
I would have thought that the main reasons installers aren't speccing them is:
1) availability (i'll have been waiting 8-9 months for mine when it gets installed) Anyone installing a Powerwall with solar at the moment has to arrange 2 visits.
2) The most common solar install is about 4kw (8-10 panels) to meet the DNO maximum export of 3680kwh means that 13.5kwh battery is not optimal for good returns. You typically see about 4-6kwh (2 or 3 modular batteries for example) being specified. Also means cheaper overall cost, so more popular and an easier sell.
3) I believe you need to be a certified installer with Tesla to sell and install the things.