Never heard of them, but their are nearly 2000 registered companies of varying ethics.
Thats why offer quotes from tried, tested and trusted installers here: https://www.powermyhome.uk/consultations/
Never be rushed into committing. Research the companies as well as the quotations. Ask for contact details for the their nearest five customers to you.
Then give them a ring and ask:
1. How did the installation go.
2. How has the system performed since installation. Has is done what the company and you expected.
Once you have the answers to these questions your decision may be a bit easier.