Its a nice tool that integrates well into a web enthusiast's tool chain. If you're curious why your page is slow and want to get more information than a GTmetrix report delivers, give this tool a try!

Review Motivation:
First of all: this review is done on the incentive of a reward, because it increases the amount of projects, pages and tracked keywords.

Short-Term Tool Review:
If you're curious about this tool, I recommend creating yourself a trial-account and play arround.

Creating a page project is easy - it results in the automatic scan and analyzation of the page and does not take much time. You get useful information in 3 categories: Pagespeed, SEO and Issues. Each of them contain useful suggestions in order to make your page better.
For one of my projects Screpy even found a JavaScript vulnerability within an included library - a problem I will fix as soon as possible! Screpy also directly linked to the reported issue.

Middle-Term Tool Review:
I will use this tool frequently for now and might update this review later to provide further details.

Deal Review:
For 49$ you can't make anything wrong.
I would love to have this deal stackable in order to have more pages to continuously monitor and analyze. I would like to charge my clients for this extra service ;)
Using the reviews, you can increase the deal conditions by up to 11 projects.
21 projects is really nice!

Within the current deal, you can have 10 projects in parallel. This value does not consume up, so if you need to analyze another webproject, simply delete an older one to free space.

Summary:
I give this tool 5 Tacos and 4 for the deal, as I would like to get either higher limits or the option to stack. But its still a solid deal. +0.5 for the incentive rewards. So overal: 5 Tacos for Screpy!