Just did this
After using H10-40s for 30 years, and swearing by them, I finally felt flush enough and thought "why shouldn't I treat myself? so bought myself DC-1X. Used AOPA discount at Pooleys to get 5% off, and claimed the maximum £100 rebate from CAA 8.33 site.
Difference is better than I expected and particularly more comfortable fit. If you are going to do it, you only have tomorrow to claim - if you order immediately online, you should get receipted invoice tonight and can claim straight away.
Be a shame to miss out on anything the CAA are prepared to give........