I took a look at a signet kits today, and was looking for things that I would have to deal with after-purchase. Not only is there no place to secure a suspension-mount for internal microphones, there's no breather hole to run the cable/clip through. You'd basically have to drill a hole, which would likely change the sound of the toms.
While this isn't necessarily a reason not to buy this series, it's definitely a pre-purchase consideration you'll need to work out.
On a semi-related note.
I had a look at an Alpine Blue kit today. Aside from the internal-mic mounting challenge, my thoughts were.
Nice looking kit. Really good sounding kit. I had 2 complaints that may or may not matter to anyone else.
If you're going to be playing under colored lighting, go for the teak or ebony. If you're going to be under white or natural lighting, the blue should be fine. The blue may be an ordeal for your lighting guy. It's also going to be an issue for your wardrobe guy if you're a stage performer and your producer uses terms like "your visual dynamic". You might have to retire that Boston hockey jersey you've worn for the last 10 years on stage.
I didn't like the finish. It felt like unfinished wood with a 300 grit sanding and a spray coat of Deft. I had expected a satin-like finish, and fear that a misplaced cup of coffee, sports-drink, or porter could be the end of an otherwise nice looking shell.