Hi,
ich just recently found Sigasi and I installed the tool today using Eclipse Indigo and Win XP. The following errors occured:
1. I can't set the heap size to -Xmx1400m as every value greater than 1000 results in a not starting Eclipse
2. after creating a project I wanted to create a new VHDL file. The program itself does nothing and the error console shows an unhandled event loop exception with the followng content:

eclipse.buildId=M20110909-1335
java.version=1.5.0_06
java.vendor=Sun Microsystems Inc.
BootLoader constants: OS=win32, ARCH=x86, WS=win32, NL=de_DE
Framework arguments: -product org.eclipse.epp.package.cpp.product
Command-line arguments: -os win32 -ws win32 -arch x86 -product org.eclipse.epp.package.cpp.product

Error
Sat Jan 21 16:39:53 CET 2012
Unhandled event loop exception

java.lang.NoSuchMethodError: java.util.Arrays.copyOf([BI)[B at org.eclipse.xtext.nodemodel.serialization.SerializationUtil.getCompleteContent(SerializationUtil.java:119) at org.eclipse.xtext.linking.lazy.LazyLinkingResource.doLoad(LazyLinkingResource.java:85) at org.eclipse.emf.ecore.resource.impl.ResourceImpl.load(ResourceImpl.java:1511) at org.eclipse.xtext.ui.codetemplates.ui.partialEditing.PartialModelEditor.createResource(PartialModelEditor.java:64) at org.eclipse.xtext.ui.codetemplates.ui.partialEditing.PartialModelEditor.setModel(PartialModelEditor.java:46) at org.eclipse.xtext.ui.codetemplates.ui.partialEditing.SourceViewerHandle.createPartialEditor(SourceViewerHandle.java:54) at org.eclipse.xtext.ui.codetemplates.ui.partialEditing.SourceViewerHandle.createPartialEditor(SourceViewerHandle.java:59) at com.sigasi.hdt.vhdl.ui.wizard.VhdlNewFileWizardPage.createViewer(VhdlNewFileWizardPage.java:35) at com.sigasi.hdt.vhdl.ui.wizard.VhdlNewFileWizardPage.createControl(VhdlNewFileWizardPage.java:117) at org.eclipse.jface.wizard.Wizard.createPageControls(Wizard.java:174) at org.eclipse.jface.wizard.WizardDialog.createPageControls(WizardDialog.java:736) at org.eclipse.jface.wizard.WizardDialog.createContents(WizardDialog.java:608) at org.eclipse.jface.window.Window.create(Window.java:431) at org.eclipse.jface.dialogs.Dialog.create(Dialog.java:1089) at org.eclipse.ui.internal.actions.NewWizardShortcutAction.run(NewWizardShortcutAction.java:122) at org.eclipse.jface.action.Action.runWithEvent(Action.java:498) at org.eclipse.jface.action.ActionContributionItem.handleWidgetSelection(ActionContributionItem.java:584) at org.eclipse.jface.action.ActionContributionItem.access$2(ActionContributionItem.java:501) at org.eclipse.jface.action.ActionContributionItem$5.handleEvent(ActionContributionItem.java:411) at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1053) at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4165) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3754) at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2696) at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2660) at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2494) at org.eclipse.ui.internal.Workbench$7.run(Workbench.java:674) at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332) at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:667) at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149) at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:123) at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196) at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110) at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:344) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:622) at org.eclipse.equinox.launcher.Main.basicRun(Main.java:577) at org.eclipse.equinox.launcher.Main.run(Main.java:1410)

Do I have to install any other Eclipse plugins to make Sigasi work??