In our case, my client had some custom shipping needs (in which he wished to apply a handling fee per product). This developer made a quick modification to the plugin and was super easy to communicate with.
It did not stop there, my client also needed to send each product in the cart as a separate shipment (which also resulted in different pricing then was provided by the UPS Access Key). Again this Developer assisted us in modifying this plugin to ensure the special shipping needs our product required where passed onto the shopper! I wish every 3rd party was as easy to work with as oneforallsoft!!
It is also worthy to note that initially we were using a different UPS Plugin but when we were in need of modifications, the other developer was impossible to communicate with. Do not make the same mistake we did, start with oneforallsoft!
The support team is super fast to respond. Awesome product for the Value! Works well on Joomla 2.5 - I am glad they worked out the SEO conflicts that I read about on early versions. If you are looking for a front end appointment solution -- look no further!