RetroEsque review for Point of Sale

The app itself is ok as long as you stick to the recommended hardware, or it just won't work! (Basically stick to American based Apple products). My issue is the features it allows in the free version are lacking, that, in retail certain abilities are considered standard. For example the ability to make an exchange on a sale and the use of existing discount codes from the website end (i can tick the box but unless I use pro it doesn't feed it through). I don't want to pay an extra £80 just for this option, so I have to the calculations manually and adjust stock manually. I don't need multiple outlets or more than 5 staff I can barely afford myself! I understand the software is different than the e-commerce software, so billing is separate, but someone really needs to look at the needs vs extras because what I need vs what I want are two very different options. Maybe allow a system of choose what you want and charge accordingly... better yet, just allow me to do exchanges and use discount codes on the POS.