I have installed One page checkout [url removed, login to view] from IT webexperts(note this version works best on my system as it stands), latest ccgv and sts modules, whilst in the majority of things it appears to be okay I do have the following issues that need to be ressolved.
It should take an experienced programmer with sts experience a day or so to complete.
1. One page checkout in conjunction with CCGV with or without sts does not use the "to be used from Gift Vouchers" but does use the redeem coupon option. (ccgv module works fine outside of one page checkout and sts mode).
2. One page checkout does not pass on descriptions of products and attributes to paypal using paypal standard.(products ordered were not listed in paypal)
[url removed, login to view] create account and no login required do not workproperly in one page checkout.
[url removed, login to view] invoice address on order changes account address not just the order. the site should work with individual order normally is allowed to be different to the invoice and delivery addresses.
basically fix the issues that exsist and any others found so that ccgv, one page checkout and sts modules work harmoniously.
Can give additional information if required.