IMHO being based on VBA gives TestPartner an advantage as it directly allows the use of references to other functionality. I can't comment on other tool's ability or lack-of in this area though.
For example I have been writing an XML Test Suite parsing system in TP and to extend TP with full XML capabilities all I had to do was add a reference to MSXML2 (and then plough through the MS "help" on using it.
Support-wise I have dealt with Compuware for a few years and have always received excellent telephone and on-site after-sales service. They really do seem to go that extra mile with support.
In terms of support my impression of Segue when we evaluated their tool was that they offered very comprehensive support as well. We got stuck during our evaluation on something and an engineer was on-site same day to help us out. Telephone support was also excellent.
Value for money:
Difficult to say Depends on what you want. If you just want to record a few macros to play back then there are far far cheaper (and free) solutions out there.
If you want to perform load/stress/performance testing take a look at the Open Source STA for an example of something "free" that offers quite a lot.
Seeing as we've selected Compuware's TP to use I better say that yes, I do think that they offer value for money - but you have to use that money wisely and realise that you will need to invest a *LOT* of time creating your automated test suites.
Although having said that, take a look at http://cisstest.com (or under their new name, http://www.simplytesting.com) - John Kent's ATAA is an excellent concept (which I've implemented my own version of here using XML and XSLT with TP) and they could potentially get you off to a flying start.
TestComplete Enterprise with concurrent licensing costs about $2600. I can tell you with absolute certainty that TestPartner with concurrent licensing does not cost $78,000 per license. [img]/images/graemlins/smile.gif[/img]