We have had good experiences rolling out timecards to our Clients using Laserfiche Forms, as long as the right expectations are set. Since Forms is great at capture, routing, and reporting on information, and this is what a timesheet is, it works really well. javascript/jquery customizations are almost a must with timesheets though, so I recommend being very fluent in scripting.

We use script to auto calculate hours based on dates, color code fields, inform the user of logical errors with their entry, etc.

It is good to remember that any quality software you decide to purchase likely required about 10 years to make (with community feedback throughout) with around 10 people working on that software over those years. So for example, if you want to create something equivalent in features and stability using Laserfiche, your in for a long haul.

Don't set the expectations that Laserfiche can REPLACE something like ADP. Determine what the needs are first, if they are extensive, a 10x10 year product may be a better fit.