skeletonbow: bundlestars.com is quite established and has put out a lot of great quality bundles in the last year IMHO. I've bought 12 bundles from them in the last year altogether, which is more than I've bought from all other bundle sites combined. :) They just opened up a storefront as well and revamped their website this last week. If anyone hasn't already discovered them, I highly recommend adding them near the top of your bundle sites bookmark folder as they're very good.
jamyskis: I wouldn't really call Bundle Stars established at all. They're essentially a Steam key repeddler owned by Focus Home Interactive. They do have some very decent deals, but unfortunately they only offer Steam keys and a lot of those games are repeats from previous bundles or very poor quality shovelware. The lack of much media coverage indicates that there hasn't been much in the way of purchases, and I find it curious that they don't have an on-site sales counter like most bundle sites do.
Personally I've only bought three bundles from them since they started, and that has usually been on the basis of two or three games each. I've never really had any other compelling reason to buy from them.
All I care about is whether a bundle site provides games that I'm interested in for a price that I think gives value to me for what I receive, and bundlestars did that 12 times in the last 12 months for me. I've also bought from Humble, Groupees, Indie Gala, and Flyingbundle and others too, but bundlestars has had the most bundles I care about.
Everyone has different tastes in games, there is no right or wrong. I prefer DRM-free games but there are not very many bundles that are DRM-free entirely and those that are out there are often not games I'm terribly interested in. If a game is only available on Steam and I want it, and it appears in a bundle somewhere with other games that I want which are only available on Steam also, then it's a deal for me personally. The games they've offered have been much more up my alley than a lot of the stuff offered by other bundle sites.
I'm not big on low budget indie games personally, and not overly fond of platformer games (Trine being a notable exception). I like games with more depth generally and which are more well known, even if they are older, but there have been some great newer titles appear as well. This isn't to say that I think every game in every bundle is awesome mind you. If I'm paying $4.50 for a bundle and it has at least 2 or 3 games that I think look really good or that I know I already want for some time, then that's an excellent price even if the other 8 games are total garbage (and can be traded on the GOG Classified's thread at a later date).
Indieroyale for example I monitor and I almost never find any of the games interesting. That doesn't mean they're bad games in any way, they're either a genre that doesn't excite me personally, or for some other reason just not my thing. I find bundlestars tends to have more established titles than a lot of the other sites, and I find that personally appealing.
What is good, is that there are numerous bundle sites that cater to different tastes and that gives us all a lot of choice. If I limited my purchases to bundles that do not provide Steam games, I'd probably never buy any bundles as the ones that offer non-Steam games - none of the games excite me. That's not right or wrong, it's just individual taste.
