Jason asks;

I use Discount Coupon v1.2 on my site and it works and works well – looking at your site its hard to see whats available in version 2.3.4 and now 5 which isn’t in version 1 to see if its actually worth upgrading. Do you have a list of whats new in the later versions?

The main changes are as follows;

Admin changes:
+ ability to see when each coupon was last used
+ ability to view all orders that used each coupon
+ ability to set a "use once, one time" coupon (instead of per customer)
+ ability to set a minimum spend before a coupon can be applied

Shop changes:
+ moved coupon input box to shopping cart (away from checkout process)
+ ability to remove a coupon after it has been applied
+ now works with Tax calcaulations

Coming Soon:
- ability to set an expiry date per coupon

Also, age old question I know but any update on the GV side of the contribution?

As yet, no-one has offered to sponsor development, hence it's (very) low down on the to-do list, as it's something that I personally do not need.

Final point then – does this work with Point and Rewards Module – I only ask the instructions for it specifically mention things which need done if using CCGV and, while I obviously know your contrib Is NOT CCGV, it does similar things so was curious to know if this was tested or if you knew of any incompatibilities?

Should work OK with all contributions, IF those contributions are decently coded. I don't know of any incompatilities with that particular contribution. My coupon system is coded far more cleanly than CCGV so I think that there should be no problem. An idea would be for someone to install a new osc, then Points and Rewards, then v1.2 of coupons and see if it all plays together nicely.