I've received Interstates with every boat I've owned (my 05 Triton is my 5th rig), and in every one, they were removed. The first boat's 24 starting and 27 trolling batteries were dying within a year. The second boat's starting and one trolling died almost completely within a few months. The third boat, fourth boat, and my current boat all had them removed upon delivery. I started replacing them in the third boat with various brands - including EverStart, Autozone's brand, Advance Auto's brand, and finally Douglas Marine 31 group, which lasted longer than the others, but still had some issues (cases for one). All were replaced at one point or another. Then I tried Trojan's SCS series of trolling motor batteries, and a 27 group Trojan starting battery, and I never changed to another brand.
I hear a lot of people talking about "convienience" in replacing a battery that goes "kaput" on the water. Well how about not having to worry about that? Wouldn't having a reliable battery under all conditions be a lot better than the "convenience" of a local Wal Mart to replace a battery that dies on day one or two of a important tournament??? I'm sure someone, somewhere, has had a Trojan die on them - I'm not saying that Trojans will never fail, but if they do, it's probably because of lack of maintenance, and even then, my Trojans have held up better than any battery on the market - even going two days between charges on a two day tournament that we were camping out for - my SCS225's (30 group) were still pulling strong at the end of day 2. For batteries, I totally believe that you "get what you pay for", and Trojan isn't that much more expensive than a lot of others - in fact, it's not the most expensive one out there - I think I paid $114 for my SCS's last year for the new boat.
So for my opinion on Interstates - Nope. I have two 1 year old 27 groups sitting on a battery tray in my garage... gathering dust.
All the best,
Glenn