Based on what Bob posted I would give this app a wide berth, not specifically because the app isn’t safe, but because JAVA is a huge target for malware. JAVA is non-essential unless you have an application or web site that you must use/visit then it is safest to avoid installing JAVA at all.

Since this app uses a JAVA applet I just wonder if it is vulnerable to JAVA exploits.

If there is a non-JAVA version that would be another option.