Here's my story so far. Phoned up to enquire about it - spoke to someone who was friendly and helpful, set me up so I could start my application and explained what was on offer.
Got some quotes from some installers, picked the one I wanted, then the Home Energy Scotland systems went down for about 2 weeks so I couldn't submit my application for the loan or get the home energy selector report from them. The selector report is done via phone call to ensure what you are wanting to get funding for is suitable for your home.
Fast forward 2 weeks, got my selector report confirmed this was a good choice and I got my report. Submitted my application for the loan.
Fast forward 16 days, got my approval for the loan, filled in loads of forms, scanned them and sent them back via email. Confirmed my order with my chosen installer.
Got my panels installed a month ago. In order for the funding to be released you need to get a EPC report done, managed to get someone local to do it for £100. Paid the installer via my CC (which was good for Section 75 protection).
Submitted my paperwork - EPC report, MCS document, Invoice showing payment, claim form, leave a review of the installation 20 days ago.
Today - still waiting on my £5k, will chase tomorrow as I'll need to raid my savings to pay my CC bill to avoid paying interest.
Postives: £5k over 120 month, will save more per year than the cost of repayments
Negatives - 1.5% admin fee on the loan (added to the loan, no choice in that) of £75, and EPC report at £100 - so £175 in extra expense you wouldn't need with a bank loan or using savings. Effort in applying.
It's a good scheme but very, very slow to process and only good if you have cash or credit to front the install or some of it, apparently you can claim up to 65% as a staging payment before the install is completed but this isn't guaranteed.
I'd hate to think how people who don't have access to lots of cash or credit would be able to use this effectively, especially if looking to get a battery as well or some sort of heat pump type solution which is even more expensive.