Ok, bought it and played around a couple of days, so I can deliver a first review, prompted by the offer of an upgrade of an additional 500 customers:

Pro:
- UI: Design looks good, in general the playful coloring, which makes me actually want to use this software
- Possibility to switch between 5 different companies issuing my invoices. As freelancer and company owner I do have 2 legal entities and 4 brands I´d like to separate. Invoice Crowd will help me do part of that trick and keep all in one place at the same time. Super welcome!
- Invoice design looks good: even though there are only 6 different templates available for my invoices, the b/w basic can always be used and looks pretty ok
- the accounting function, which at least means a total of your revenue and some numbers important to me. There are free invoicing services out there, but I don´t want to copy into Excel, and this might potentially save me a lot of time.

Contra:
- Little quirks are annoying, e.g. in Austria we do not write the ZIP after, but in front of the city name, however this can´t be changed. I also don´t need "State" in a small country like Austria, but only to put my country and city. You can leave it out, but the writing order will be negatively effected.
- Again, little design mistakes: there is no space in between "Bill to" and the customer name, but one free line between "Bill from" and my company name, resulting in an uneven look. There is also no easy avail to fix it yourself.
- White label is great, and needed, but you still find their Crowdinvoice Logo on the bottom of your online invoice. For my customers this looks "cheap", as in "free service" you seem to be using.

All in all it is good enough for me to give it a try, and leave my free alternative for it. I hope, I won´t regret it, but considering all points, I think it is well worth a LTD.