I was thinking about this for awhile so I'm thrilled that my sister and her husband got me the first two volumes. I love TMNT and it has it's share of reboots. This one comes from IDW.
This ws so much fun to read and I usually don't like origin stories. The storytelling does change things up by going back and forth from the past to the present. Things change and add interesting twists to the tale and the characters themselves. April appears in their lives much earlier and Casey instantly endears himself to Ralph. Likely the reader too.
There are questions that aren't really addressed like why Splinter could teach them combat. Do the turtles remember anything from their lives before like Splinter does ? It says why Casey doesn't make a big deal out of a giant turtle but not why no one else bats an eyes. But I'm really not in a rush to get answers because this trade was pretty entertaining. After the disappointment and aggravation of the first Titans Hunt issue and Grayson I needed a trade like this.
The only nickpick I could give is Donatello being a little too aggressive when arguing with Leonardo. Their situation was tense for a good reason it just threw me since Donnie is usually more reasonable. Ralphels' story does provide some details for why this version might feel isolated from his brothers and have his temper. That's a guess given the character but with the set up it'd make sense. Besides Ralphel only Splinter really gets a good look at. Even before he's changed you get a sense of his intelligence and emotional connection to others. You get why he's enemies with Old Hob and feel for his sense of helplessness.
This is mainly a family story which pays off at the end of the trade. I don't want to spoil too much of this but if you're a fan of TMNT you'll probably love this.