SNMP broadcasts across subnets

We recently installed a piece of software that discovers/manages the Neoware thin clients on our network.   It discovered the local thin clients successfully, but I had to make some modifications on our Cisco 3550 switch to enable the discovery broadcasts to cross to the other subnets.

First, I added a route on the computer with the management software pointing to the switch, then added the following on the switch (as suggested by NeoWare):
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access-list 102 permit ip any any
access-list 152 permit ip any any
access-list 176 permit udp host 10.x.x.x any eq 161
access-list 176 deny ip any any
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interface Ethernet1
ip access-group 102 in
ip access-group 152 out
ip directed-broadcast 176
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I'm obviously skipping a lot of the config, but that's it in a nutshell, and it does the trick.   My question is: are there any drawbacks this?   There's ten subnets I'm looking across, connected via 10MB fiber, with only minimal (Citrix) data crossing, so there seems to be plenty of bandwidth; also, this entire setup is behind a firewall, so shouldn't be a security issue.

Again, we're not experiencing any problems, just want to make sure this won't cause us any problems in the future.